MiSTer updates and changelog

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MiSTer:
- Improved file lister. Now it shows updated catalog with every opening.
- Display available space on storage in system settings.
- Support for settings update from the core.
- Option to temporary map joystick buttons to keys. Useful for cores not supporting the joystick, or map additional keys to joystick buttons.

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ZX Spectrum:
- *.z80 snapshot loading.
- Quick switch between Spectrum model presets (Alt-F1..Alt-F6)
- Switch CPU speed from OSD as well.
- Alternative ROM with Real Commander instead of Gluk.
- Fix General Sound. Limit GS RAM to 2MB.
- Some other minor fixes and improvements.

Read the updated ReadMe.
This release requires MiSTer binary update!

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MiSTer:
- Fix: unable to use joystick in OSD if mapped to keyboard.

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VIC20:
- Some fixes in C1541
- Support all loading addresses for header-less cartridges.
Read the updated ReadMe.

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MiSTer:
- Improved button/key remapping for game.
Now you can map one button to another button for convenience. For example game uses dpad UP for jump while you prefer to use a separate button for jumping. Also key can be mapped to another key for the same purpose. And of course you can map the button to a key if game doesn't support the joystick.

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TurboGrafx16/PC Engine:
- SuperGrafx mode
- A lot of fixes and tweaks.

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TurboGrafx16/PC Engine:
- Option of 64 sprites per line (reduces flickering in some games).
- Fix audio.
- Many fixes and tweaks in video.

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Genesis:
- Support for Super Street Fighter II mapper.
- Fixes and tweaks in video.
- Fixes and tweaks in audio.

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VIC20:
- Add NTSC mode.
- some fixes in C1541.

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MiSTer:
- Support for composite RBF (boot.rom inside RBF).

to inject the ROM, use this utility:
https://github.com/MiSTer-devel/Injector_MiSTer

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Arcade Scramble:
- Separate button for bomb.

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Genesis:
- PAL mode, JP/US/EU region. (OSD option and F1-F3 keys to choose)
- Support for interlace and double resolution (Sonic 2 split screen)
- Fix the audio frequencies between FM and PSG.
- VDP debug register (Titan Overdrive 2 semi-transparency)
- VDP 128K mode/fast 8bit DMA (Titan Overdrive 2)
- A lot of VDP fixes - many games now look correct.

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Genesis:
- Implement sprite cache (Titan Overdrive 2)
- Implement Shadow/Highlight (Vectorman, Titan Overdrive 2, Sonic 2 Night mode)
- Adjust scaler parameters for clearer picture.
- Switch to other 68K CPU (some fixes in Jim Power)
- Some fixes in FM and PSG
- Fixes and tweaks in VDP.
- Other fixes and tweaks.

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Genesis:
- VDP: Fix CODE behavior (Lotus Turbo Challenge, Shinobi III)
- VDP: fix sprites endless loop (Adventures of Mighty Max)
- CPU: fix word swapping (Jim Power)
- Implement TAS bug (Gargoyles)
- FM: fix the timers (music in Thunder Force IV, Double Dragon 2, Titan Overdrive 2)
- Auto region according to file extension (read the ReadMe)
- Gamepad has 3 buttons mode by default
- Other fixes and tweaks.

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Genesis (re-release!):
- fix Jim Power graphics.

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Genesis:
- Use nearest neighbor scaling.
- Update scanline FX to new scaling algo.
- Fix some port unused bits (Turrican)
- VDP: fix window in H40 (Rolling Thunder 2)

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MiSTer:
- Load <core>/coeff.txt to scaler on supported cores.
- ini option for vertical integer scaling.
- Merge SharpMZ support code.

Genesis:
- Update unused bits values (NBA Jam)
- Fix scanlines FX
- VDP fixes (Bram Stokers Dracula, Fatal Rewind)
- FM: implement LFO. Increase the volume.
- Support for external coefficients for scaler (update the MiSTer!).

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SMS:
- Save support
- Many fixes from GreyRogue
- Some fixes and updates from me.
- Support for scaler coefficients loading

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Genesis:
- Many fixes and tweaks in VDP.

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Genesis:
- Fix Z80 control (broken sound in SSF2,Xenon2)
- Fix interrupts (broken backgrounds in SSF2)
- Support for invalid backgrounds (Super Skidmarks)
- Adjust FIFO throttle (dots in Outrunners USA)
- Remove unused TMSS replacement ROM.
- Adjust RAM/ROM access.

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MiSTer:
- Joystick: system-wide definition for menu navigation.
Joystick buttons defined in Menu core are now used for menu navigation for all cores.

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Genesis:
- Fix Shadow/Highlight (Toughman Contest).
- 2-stage sprite render for precise timings (Titan 1/2).
- SRAM support (Buck Rogers and other games)
- Relax VDP external slots in inactive area (glitches in Clue, Sonic 1)
- Rework Z80 BUS.
- Rework 68K BUS.
- Clear VRAM/RAM on ROM loading (fix garbage in some ROMs)
- Audio tweaks for HDMI (possible audio absence fix on some TVs).

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Linux:
- Support for MIDI (Minimig, ao486)

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Genesis:
- Support on-cart SRAM (Buck Rogers, Primetime NFL, some other games)
- Fix shadow/highlight (Toughman Contest)
- Fix HINT in the last line (Sonic 1 garbage, Turbo Outrun)
- Fix FM reset (Turbo outrun)
- Update JT12(FM) to latest version (should fix the sound in many games)
- Fixes in VDP (Viewpoint).
- Option for fast VRAM access (fixes Clue garbage in NTSC mode)

[cvenditti]

New core: Altair 8800
https://github.com/MiSTer-devel/Altair8800_Mister