Also adds better documentation and removes the one-off reimplementation
of the function in pica.h.

- Centralizes color format encode/decode functions.
- Fixes endianness issues.
- Implements remaining framebuffer formats in the debugger.

This effectively adds support for a lot texture formats in the rasterizer.

This better reflects that no commands are supposed to show up until you hit the button a second time.

Double-clicking a texture parameter command in the pica command lists will spawn these as a new tab in the pica command list dock area.

The texture viewer is enabled when selecting a write command to one of the texture config registers.

Changed start/stop button to reflect current tracing status.
Properly labeled column headers.

Pica/citra-qt: Replace command list view and command list debugging code with something more sophisticated.

While it was some nice and fancy template usage, it ultimately had many practical issues regarding length of involved expressions under regular usage as well as common code completion tools not being able to handle the structures.
Instead, we now use a more conventional approach which is a lot more clean to use.