Window class update

[staxfur]

This PR updates the window class to handle 24bit / 8bit and 4bit colors in one implementation.

Fixes #128, #96, #107.

WIP: #108.

[flagarde]

Does this is superseded by your new PR?

[staxfur]

Well #191 implements #190, which isn't covered by this PR, but the whole auto color stuff comes from this PR.

The reason was that this PR gotten a bit over my head, so I rather split it into smaller things so the window class update can be easily merged without having a big mess of different color functions and everything.

So the plan is:

• Merge Implemented new base.hpp structure #191
• Apply the new Color functions into a unified Window class version (Currently there is one window class for 4bit and one for 24bit, while the 24bit class doesn't work on macos due to lack of support)
• Update the 24bit example to use the auto color function
• Probably also a cleanup and upgrading the Prompt to 24bit colors as well
• Also the platform header should be pruned and simplified.

[flagarde]

@MCWertGaming does this PR should be closed ? The platform header should be pruned and simplified. could be solved in other PR (maybe creating an issue for this)

[staxfur]

Yeah I moved it into #213.