pEMU 5.1

• pfbneo: fix some games (sfiii2,...) and megadrive system (sf2,...)
• pfbneo: fix video reinit code (mainly used by megadrive games)
• pfbneo: update gamelist.xml (fix mslug hacks system set as atomiswave, some clones, hacks and hb...)
• pfbneo: fix tg16 system id
• pfbneo: add/fix diagnostic and reset keys (press start 3 secondes for diag, coin 3 secondes for reset)
• pfbneo: fix Victory (Comsoft) system
• pfbneo: major input refactor (fix mortal kombat, outrun, etc...)
• pfbneo: handle fire6/fire7 (L2/R2) buttons
• pfbneo: use integers when possible for game list filtering (speed up system filtering)
• pfbneo: fix some flipped games orientation (comad..)
• pfbneo: use hiscore.dat from romfs
• pfbneo: remove audio sync option (automatically enabled when force 60hz option is disabled)
• pfbneo (switch): fix/invert fire buttons
• psnes: fix 50hz audio
• psnes (switch): update skins textures
• pnes: update gamelist.xml
• pnes: fix paths (for NstDatabase.xml, etc...)
• pnes: always force audio sync
• pnes: use romfs for NstDatabase.xml
• pnes: update nestopia to latest git revision (c103378)
• pnes: fix states menu
• pnes (ps4): fix datadir
• pnes/psnes: disable auto aspect ratio scaling mode
• pnes/psnes: improve scaling
• common: improve audio code/quality
• common: use zip names by default for rom listing
• common: fix per emulator config override
• common: fix L/R system switch on non fbneo cores
• common: fix messagebox title width
• common: add status box for info messages, add very few tips
• common: use point filtering for fonts
• common: correctly handle games aspect ratio
• common: add scaling mode option (auto/aspect/integer)
• switch: change menus buttons to L/R, fire 5/6 to ZL/ZR
• switch: fix slow (roms) loading at startup
• switch: fix for latest devkitpro changes
• switch: fix some shaders
• ps4: fix a lot of crashing games (memory fix)
• ps4: enable video previews
• ps4: fix default inputs configuration (L STICK for start, R STICK for coins, etc..)