add automated tests and fix many gb / gba bugs (see below)

[ITotalJustice]

fix gb tima reload being delayed by 4 cycles

fix gb tima not being clocked on div write when wanted bit is falling edge

fix apu frame sequencer timing

fix gba vram mirroring read value when reading whilst in bitmap mode

fix gba sram not being mirrored to 0xF region

fix gb stat_line being incorrectly reset on lcd_disable

fix gb lyc incorrectly being compared whilst lcd is disabled

fix gb mbc2 ram r/w when using raw pointer tables

fix gb mbc1 missing call to update_ram_banks() after updating the modes

fix gb building in non sched mode

fix gbc wram bank1 not being memset to 0 (which is what the bios does)

fix gb startup io reg values

fix gb startup cpu reg values

fix gb dma not returning the last written value

fix gb ppu mode on lcd enable. stat reads mode as 0 until the mode is update (~80 cycles).

fix gb ppu not skipping the first frame of the lcd being enabled.

fix gbc palette data register being accessible during mode3, access is only allowed in mode0,1,2

fix gba halt skipping to only set scheduler cycles to event cycles if event cycles is >= than scheduler cycles

fix gba wave ram reads.

add back halt bug in gb cpu (still need to test if this occurs on agb).

add r/w function tables to gb to replace switch. this is how i handle it in gba code as well

add ctest support along with automated testing via github

remove std::ranges from core