MiSTer updates and changelog

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Genesis:
- Virtual light gun support (Shane Lynch).
- SNAC support (blue212).
- Adaptive composite blend (based on ElectronAsh's idea)
- Some other fixes.

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MegaCD:
- Virtual light gun support (Shane Lynch).
- SNAC support (blue212).
- Adaptive composite blend (based on ElectronAsh's idea)
- Some other fixes.

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Atari ST:
- Fix double "/"

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C16, VIC20:
- CPU, C1541: update to latest changes.
- Update the framework.

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Minimig:
- Adjust Vsync position to real hardware (paulb-nl)
- Update the framework

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Minimig:
- fix 68000 mode (broken in previous release).

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Atari ST:
- Port the real turbo mode for Mega STe and STeriod from latest Gyurco's changes.

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SAM Coupe:
- Update SDRAM controller.
- Update the framework.
- Cleanup and fix the timings.

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Archie, Atari 800, Atari 5200:
- Update the framework.
- Update SDRAM controller.

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Amstrad, ao486, Apogee, Apple II:
- Update the framework.
- Some other updates.

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BBCMicro, BK0011M, ColecoVision, Gameboy:
- Update the framework.
- Some other updates.

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NeoGeo:
- Update the framework.

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MSX:
- Update to OCM v3.8 changes.
- Update OPLL voice ROM (Kitrinx).
- Tape input (Fernando Mosquera)
- Some fixes and tweaks.
- Update the framework.

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MacPlus:
- Update SDRAM controller.
- Update TG68K to latest version.
- Other fixes and tweaks.
- Update the framework.

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SNES, SMS, Specialist, Vector-06C, Atari 2600, Memtest:
- Update the framework.
- Some other fixes.

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Vectrex, TSConf:
- Update/fix audio modules.
- Update the framework.

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GBA, Jupiter, Aquarius, Astrocade, ZX Spectrum, ZX81, PET 2001, QL:
- Various per core fixes and tweaks.
- Update the framework.

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Arduboy, Oric, AY-3-8500:
- Update the framework.