Added class: Label, a GUI element for showing text etc. on screen.
Added placeholders for: class Enemy, class Projectile.
Edited class: Button, to support textures, while maintaining proper scaling.
Added files: shaders required by uth::Text.

IMPORTANT:
UtH Engine shall not be updated anymore, to avoid further havoc.
Related changes:
Edited uth::Transform: Inserted method SetToScale the the header file.