Add rudimentary test suite.

Transliterates some of FontConfig's unittests to ensure the language bindings don't break things.
Could still be tested further.

Document FontConfig Strings & Weights bindings, utilize weight bindings for CSS bindings.

Document FcConfig language bindings, compile-fix exposing FontFaceParser.

Document FcRange bindings, expose FontFaceParser, & document LangResult enum.

Document FcLangSet language bindings.

Document FcCharSet language bindings.

Document FcValue language bindings.

Document FcObjectSet language bindings.

Document FreeType integration.

Document FcFontSet language bindings.

Document FcPattern language bindings.

Upload documentation on initialization/finalization routines.

Add API for dereferencing & rendering glyphs.

Transliterate FTFC into these FontConfig language bindings.

Expose convenience APIs for coercing values & pattern properties to a type.

Fix remaining segfaults.

Catch one FcFontSet segfault.

Parse src property for @font-face into custom FontConfig property.

Parse unicode-range property for @font-face.

Parse font-variation-settings property for @font-face.