Add type annotations

[tyoeer]

Type annotations improve the IDE experience, and sumneko's LSP allows exporting of information through --doc.

• In order to find constructors that need specifying, remove the vararg/... in the type boilerplate in main.lua
• Subtypes don't work well with the current way of specifying :new()

[tyoeer]

Class: all classes have been annotated as such, and have their supers set New: the constructor has been provided types, and subtypes have been defined/annotated. Desc: Class has a description Methods: Methods have types (and description where relevant)

• [ ] ui/
  • [ ] base/
  • [x] class
  • [x] new
  • [ ] desc
  • [ ] methods
  • [ ] widgets/
  • [x] class
  • [x] new
  • [ ] desc
  • [ ] methods
  • [ ] layout/
  • [x] class
  • [x] new WIP
  • [ ] desc
  • [ ] methods
  • [ ] tools/
  • [x] class
  • [x] new
  • [ ] desc
  • [ ] methods
• [ ] levelhead/
  • [ ] campaign/
  • [ ] class WIP
  • [ ] new WIP
  • [ ] desc
  • [ ] methods
  • [ ] data/
  • [ ] class WIP
  • [ ] new WIP
  • [ ] desc
  • [ ] methods
  • [ ] level/
  • [x] class
  • [x] new
  • [ ] desc
  • [ ] methods
  • [ ] lhs/
  • [ ] class
  • [ ] new
  • [ ] desc
  • [ ] methods
  • [ ] The rest
  • [ ] class WIP
  • [ ] new WIP
  • [ ] desc
  • [ ] methods
• [ ] tools/
  • [x] class
  • [x] new
  • [ ] desc
  • [ ] methods
• [ ] chaoshead/
  • [ ] class WIP
  • [ ] new
  • [ ] desc
  • [ ] methods
• [ ] Other stuff