Compiler Rewrite

This update contains a complete rewrite of the Rumor compiler.

If you find Rumor useful, consider supporting continued development of this framework by becoming a patron.

Added

• You can now add the enum argument cant_skip to the end of a pause statement
  to ignore advances until the pause ends
• You can now add the enum argument no_wait to the end of an add or say
  statement to auto advance the dialog
• Variable substitution with { and } in strings is now supported

Changed

• The compiler no longer uses a tokenizer except when parsing expressions
• Compiler errors are more specific and descriptive
• The Exodrifter.Rumor.Lang namespace has been renamed to
  Exodrifter.Rumor.Language
• All unit tests and examples are wrapped in a UNITY_EDITOR ifdef to make
  it easier to use this repository as a submodule in non-unity project
• Bindings are no longer stored in Rumor; instead, it is now stored in
  Bindings
• Rumor.Run has been renamed to Rumor.Start in order to match the language
  used in C# Thread.Start and Unity's StartCoroutine method to improve
  consistency