Greatly improve the accuracy of the Timers, DMA & IRQs.

[Arignir]

This MR greatly improves the accuracy of the Timer, DMA & IRQs.

Noticeably, the Timer, Timer Count-up, Timer IRQs and DMA tests of the mGBA suite were greatly improved:

• Timer: 1918/2020 => 1974/2020
• Timer Count-Up: 211/936 => 513/936
• Timer IRQs: 28/90 => 90/90
• DMA: 1156/1256 => 1220/1256

On top of that, the following nba hardware tests roms are now passing and have been added to the accuracy checker:

• IRQ Delay
• Timer Reload
• Timer Start/Stop
• DMA Latch
• DMA Start Delay

On top of that, all those accuracy improvements fixed this issue: #13.