This makes the code more readable than using e.g. `VidpScrollRegion[0]`,
`VidpScrollRegion[1]` etc. instead of `VidpScrollRegion.Left`,
`VidpScrollRegion.Top` respectively.
Based on a suggestion by Dmitry Borisov.
In addition:
- move back common function prototypes to precomp.h;
- const-ify `VidpFontData` and adjust its usages;
- improve SAL annotations for `InitPaletteWithTable()`;
- rename the (Vid)ResetDisplay() parameter to "SetMode".
- Add boot video color constants
- Refactor palette initialization
- Move some common stuff in right place
- Get rid of some magic constants and hardcoded values
- Get rid of TopDelta variable (calculated at compile time)
- Update SAL annotations
Addendum to 5f2ca473. CORE-16216 CORE-16219
- Import cmdcnst.h and vga.h headers from the 'vga_new' VGA Miniport Driver,
that contain definitions related to VGA registers as well as command-stream
functionality.
- Replace a bunch of hardcoded values by their corresponding defintions.
- Replace "Captain-Obvious" comments in VgaIsPresent() with actual
explanations from the corresponding function in 'vga_new'.
- Simplify the VgaInterpretCmdStream() function, based on the
corresponding one from 'vga_new'.
- Use concise comments in the 'AT_Initialization' command stream definition.
- Import the 'VGA_640x480' initialization command stream from 'vga_new'
and use it as the full VGA initialization stream whenever the HAL
does not handle the VGA display (HalResetDisplay() returning FALSE).
Otherwise we just use the 'AT_Initialization' command stream that
performs minimal initialization.
- Remove unused AT_Initialization and other declarations from ARM build.
