Reorganized models functionality, it still needs some review...

* Unused UWP define removal

* Further removal of unusued UWP defines

Co-authored-by: Jeffery Myers <JefMyers@blizzard.com>

* Implemented remaining 7/8 of ImageDrawLine

The existing code was correct for one octant, it now works for all 8
Added two internal functions, _ImageDrawLineHorizontal and _ImageDrawLineVertical, whithout which it would've been 4 times as much code.

* ImageDrawLine: Replaced 3 functions with 1

Removed both freshly added internal functions
Crammed it all into one

* ImageDrawLine shortened significantly using maths

Substituted X and Y, then wrote one abstract loop instead of 4 specific loops.
Lots of comments to explain what I'm doing for future maintainers.

* Now conforms with style conventions

Also reworded a comment to sound more... fomal.

Legacy keyboard support was blocking the render loop, also it was keeping the last key status until the next key.

* GenMeshTangents Fix

* GenMeshTangents Fix - Comment Update

* GenMeshTangents Fix - Comment Update final

* Code Style Changes

* Code Style Changes Final

* Code Style Changes Final 2

* GenMeshTangents better handling for issue #1876

* GenMeshTangents better handling for issue #1876

* GenMeshTangents: Better fix for issue #1876

* vboId location fix

* GenMeshTangents Fix

* GenMeshTangents Fix - Comment Update

* GenMeshTangents Fix - Comment Update final

* Code Style Changes

* Code Style Changes Final

Simplified the example

- fixed issue where vertex positions being passed in place of vertex normals.

This design should probably be changed...

After lot of investigation, I'm afraid I'm removing official UWP support from raylib, I'll keep the current implementation in a separate branch (UWP), just in case. It seems Microsoft is trying to replace UWP in the long term, they announced lack of support for the new WinUI 3 and they seem to be moving to Windows App SDK.

Also, on current implementation, the code is divided between raylib and the example, requiring multiple callback hooks, making it difficult to follow and maintain.

And realistically speaking, raylib is probably not the best option for anyone willing to target UWP, neither Xbox consoles.