Data model changes for fulib v2

[Clashsoft]

The following changes are planned for the data model in fulib v2:

• FMethod
  • Renamed to Method.
  • modifiers: String → modifiers: Set<String>
  • annotations: String → annotations: List<String>
  • methodBody: String → body: String
  • params: LinkedHashMap<String, String> → parameters: List<Parameter>
  • typeParams: LinkedHashMap<String, String> → typeParameters: List<Parameter>
  • declaration no longer listenable (it never worked as intended, change events would only be fired when using setDeclaration, not via any of the other dozen methods that could change the declaration).
• (new) Parameter
  • name: String
  • type: String
  • annotations: List<String>