Fix font-feature support, simplify API, & add type signatures.

Commit missing module dealing with uncached fonts.

Fix compilation issues with restructure back to Typograffiti's original.

Draft cached text rendering API.

Draft public API akin to existing Typograffiti API.

Start refactoring to resemble existing Typograffiti structure.

Fix text rendering.

Add higher-level API abstracting away glyphs!

Incoporate explicit shaders, some GPU drivers require this.

Incoporate Harfbuzz layout input.

Init (Transliterated from Gelatin to raw OpenGL with Harfbuzz glyphs).