Build vmu file name with game ID so that all disks of multidisk games
share the same vmu (A1 only, or all with libretro when enabled).
Rename existing vmu file to new format if none exists.
Issue #1556
Retrieve last frame rgb data (gl, vk, dx9, dx11).
Specific save screenshot code for android, iOS and UWP.
Add Save Screenshot emu key (F12 by default)
vk: defer deletion of in-flight textures when texture cache is cleared.
vk: fix issue when updating imgui textures after a render pass has begun
(achievements)
vk: palette texture not updated after a state has been loaded.
gl: Move opengl-specific stuff into opengl imgui driver.
savestate: Add non compressed header, following by screenshot png data,
before actual savestate.
Issue #842
introduce Storage abstraction interfaces
use Storage i/f to load zip and 7z archives, cdi/cue/gdi/chd media,
cheats and to find custom textures.
Use android file picker to add storage. Request persisted access perms.
jni helper classes.
Issue #813
Verify md5 of flash, eeprom, vmus if no savestate used
Use chd header SHA1 as digest
Load .state.net state file at start
Force real BIOS for some games
Flyinghead