Prepare for 0.1.0

[yanchith]

After 0.1.0 there should be significantly less API churn, but we need to implement more features before stabilizing anything - to find out what the "final" API looks like. Apart from features and API changes, we need better test coverage and documentation.

We need at least:

• Cubemaps (Add Cubemap #19)
• Renderbuffers (Add Renderbuffer #18)
• Decent test coverage (Add tests #26)
• Document all public APIs (Audit and improve all public API documentation #24)
• Add tutorial examples
• Improve showcase examples
• Document all examples (Document all examples #25)
• Website with API docs (Website #39, API docs on website #40)
• API cleanup
  • After implementing Cubemap and Renderbuffer decide, whether uniforms and textures should really be separate
    • Nope, the implementation can tell them apart, no need to separate them in the API. This also plays well with the new uniform types introduced in the Cubemap branch
  • Replace Command.locate() with AttributeLocation (Add AttributeLocation and remove Command.locate() #36)
  • Decide the "enum hierarchy".
    • Enums are per use-case and there is no hierarchy as a result of Investigate --preserveConstEnums #17
  • Investigate making the library tree-shaking friendly (Change API to be tree-shaking friendly #53)
    • Won't be happening for 0.1.0, but may revisit later