Fix HDMA, MBC3 and improve the debugger

[alloncm]

• HDMA bug fixes:
  1. The vram dma transfer cycles counter was global and would not reset until the current transfer will end so upon certain threshold it no longer made transfers until the game canceled it
  2. The verification check that we are on different LY was not correct and was biased from the last trasnfer since it was never cleared to an invalid value, now using an Option to indicate new transfer
  3. Halt HDMA HBlank transfer during CPU halt
• Add more functionality to the debugger
  1. Handle banks properly, allowing proper debugging of multi banks roms
  2. Add SkipHalt command to continue until the CPU is unhalted
  3. Improved memory dumping
• Update readme
• Multiple bug fixes for MBC3 causing it to panic
• Add integration test for HDMA HBlank mode

Closes #126
Closes #114