Fix problem with Majora's Mask subscreen after Bomber's Notebook read, #698
The game switches to interlaced mode when it opens Notebook screen and background buffer is removed.
This hack prevents buffers clear on VI change.
Quake II uses single buffer mode when underwater, so additional check
gDP.colorImage.changed != 0 is necessary to detect frame change.
This check may cause dummy buffers swaps, so now it is used for Quake II only.
Fixed#592
- move flag CHANGED_CPU_FB_WRITE from gSP to gDP (code refactor)
- enable CHANGED_CPU_FB_WRITE on video init.
- disable CHANGED_CPU_FB_WRITE in process display list.
many pd roms and demos use cpu rendering only
now they are supported with default settings
also detectCFB=1 now isn't needed anymore for some games
Commit is based on changes made by purplemarshmallow in #536
