* Update grammar
* WIP with tracking classes
- Refactor AvailableUserFunction to AvailableParseTree
- Track ClassDeclarationContexts similarly to user functions
* Skeleton AST + tracking
* Finish up AST building
* Implement AST building
- TODO decide better name for UserFunctionBuilder/Visitor,
since it does both user functions and classes
* Update Prettifier
* Crude, first-round semantic analysis + codegen
- Currently, no real difference from regular functions
* Move class var statements to top level statements
* Add semantic analysis for base class existence
* Introduce ClassInstance AST node for generating `this` parameter
* Skeleton create class instance instruction
* Default ctor; 'this' byref; Error if multiple same baseclass
* Update grammar for scoped funcrefs and scoped identifiers
* Update prettifier, builders for scoped funcref, identifiers
* Fix CI issues
- Styling
- Shadowing
* Add grammar tests for scope; Remove scope from switch label
* Final draft todos
- Rename `VarStatement::class_name` to `scope`
- Comment why identifiers dont have scopes in enum declarations
- Remove code comment
* added escriptgrammar as external lib where it belongs. Silenced warnings.
* bscript compiler warning fixes
* special include file to get rid of gcc warnings about antlr4
* misc windows warnings
* time specifc warnings
* buildfix + apple warnings
* never trust apple
* windows debug build warnings
* some windows clang warnings
* last warning fix
* Move more specialized expression types from optimizer to AST builder
VarStatement now handles its own value consumption
* Move assign-multisubscript-consume logic to the instruction generator
