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Hardware sprite now scales with video output, courtesy of mntmn! Some fixes and changes to mouse cursor position when scaled, plus some graphics acceleration changes to make it easier to use.

Merge pull request 'video_mode_things' (#7) from shanshe/zz9000-firmware:video_mode_things into video_mode_things

This bug could trigger when a pattern or template was rendered closer than 8 pixels away from the screen border.

z3: delay datastrobe sampling by 1 cycle to make cyberstorm mk1/2 happy. disable dtack timeout register for production.

- switch M00 to AXI3
- remove a lot of unnecessary static register inits
- centralize Z3 data strobe flags
- react quicker to FCS, address, r/w and strobes to fix A4000/CyberStorm
- make dtack timeout controllable and default to 3 cycles
- pipeline some registers
- unify Denise(A500) and Videoslot capture
- one-hot encode videocap state machine
- decouple z_reset from zorro_state case