David Tyler comments

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                                            David Tyler

Improve prefetch unit until it passes all mgba timing tests

![image](https://user-images.githubusercontent.com/1358414/163003079-1953c817-727d-47fc-9dba-db9fa172c130.png) 118 tests left to go, I haven't counted but I think the two cases left are: 1. LDMIA across ROM boundary (maybe just a case of checking when SEQ...

Improve prefetch unit until it passes all mgba timing tests

The large number of "2 cycle" failures are because the CPU should have managed to read the timer value _before_ getting blocked by DMA because the code is in IWRAM...

Improve prefetch unit until it passes all mgba timing tests

Rough plan to solve the DMA/CPU issue is to properly emulate the bus owner at any given cycle. That means a new flag on the bus and DMA setting/unsetting it...

Improve prefetch unit until it passes all mgba timing tests

![image](https://user-images.githubusercontent.com/1358414/163872613-317f4ea4-cab1-47ab-8b3d-aac8cdb5e978.png) Hot _damn_ was that ever really tedious to figure out.

HBlank Bit tests failing on mgba suite

![image](https://user-images.githubusercontent.com/1358414/161338977-be148e02-da67-4b9a-a6e0-3fc303c4d1ec.png)

HBlank Bit tests failing on mgba suite

Haven't really done much to specifically pass these but as I fix ppu timing roms and various other roms this one is starting to come together

Tactics Ogre - Knights of Lodis has weird background effect

https://github.com/DaveTCode/GBADotnet/issues/50 shows the last time I was working on this rom and has screenshots showing the background without psychedelics!

Fix zayd DMA timing roms

Only one I'm correct on is the fast DMA, the others I'm off by at most 1 cycle but in random directions and cases

Fix zayd prefetch roms

Tests here are from https://github.com/GhostRain0/PrefetchAbuse

Fix zayd prefetch roms

Each column in the test refers to a different wait state configuration: | Column | WaitState | Region 0 | Region 1 | Region 2 | |--------|-----------|----------|----------|----------| | 1 |...