Tracking Issue: video headers implementation status

[LunarLambda]

Implementation status (as of https://github.com/LunarLambda/libseven/commit/00f7f12d601eecdb607cb36ab7d49fdf64b3bc2c)

<seven/hw/video.h>

• [x] Display control (DISPCNT, DISPSTAT, VCOUNT)
• [x] Background control (BGxCNT)
• [x] Memory maps (Palettes)

<seven/video/bg_affine.h>

• [x] Affine background registers
• [ ] Affine transform functions?

<seven/video/bg_bitmap.h>

• [x] Memory maps (Framebuffers)
• [x] Buffer swapping / 'page flipping' function
• [ ] Drawing functions?

<seven/video/bg_regular.h>

• [x] Definitions
• [ ] Functions (tilewise copy, large map tile loading?)

<seven/video/blend.h>

• [x] Registers
• [ ] Helper macros
• [ ] Functions

<seven/video/color.h>

• [x] Basic RGB5 / RGB8 macros, color bitfields
• [ ] Color math/effect functions
• [ ] Predefined colors

<seven/video/mosaic.h>

• [x] Registers, bitfields

<seven/video/object.h> (TODO)

• [ ] Definitions
• [ ] Functions (movement, etc?)
• [ ] Affine definitions
• [ ] Affine functions

<seven/video/palette.h> (TODO)

• [ ] Palette effect functions

<seven/video/scroll.h>

• [x] Scroll registers (BGxHOFS, BGxVOFS)
• [ ] Scroll functions (i.e. to handle write-only nature?)

<seven/video/window.h>

• [x] Registers
• [ ] Functions (Rectangle setting?)

[LunarLambda]

2022-02-01: Resolved open questions, updated header naming

[LunarLambda]

Updated and rename the issue, since video header organisation is now basically figured out.