redesigning intro.tasm

[ThomasTheSpaceFox]

The current introduction program is rather old. infact parts of it trace back to mark 1. and due to recent enhancements to the VM, just doesn't show all what mark 2 can do and what SBTCVM is as well as it used to.
here is a draft for a possible splash screen. (upscaled a bit)

@SBTCVM/core-devs feel free to suggest ideas. we can use several troms if really needed.

also it be nice to take advantage of SBTGA and the 3-voice sound as well.
even though SBTGA's sprite support is awaiting design & implementation, it should still help to make the introduction a tad bit less dull.

[ThomasTheSpaceFox]

Note: changed SBTGA's behavior for ram banks other than bank A. it now uses the same Bank as the thread that updates it. ( i.e. if a thread was on bank C and called SBTGA's update address, SBTGA would look at the data on bank C.) This should help if the intro winds up being multiple ROMS.
d49e530

[ThomasTheSpaceFox]

i just realized that pixel-art version of the blue logo actually fits in the color plotter perfectly. well. thats convenient.