Various fixes/missing fields

[florian1345]

Just an informal collection of problems I encountered and fixed locally. Sorry for not presenting it in a more organized way. Feel free to modify/integrate it however you like.

• Added name field to TypeDefinition nodes
• Added isVirtual and isOverride fields to ModifierDefinition nodes
• Added support for parsing for FunctionCallOptions (of the form fn{key=value}(args))
• Added support for parsing IndexRangeAccesses (of the form array[from:to])
• Added proper nodes for the ReturnStatement, BreakStatement, and ContinueStatement (which were previously rendered as the return expression or just ';' for expression-less statements)
• Fixed parser discarding all variable declarations in a variable declaration list if one is None
• Fixed parser failing if an assembly member's identifier is a list (not quite sure where that was a problem TBH)
• Fixed parser failing an assembly assignment to a member

I added some more fixes with commit eb548d1 on 2022-05-12:

• Added isDeclaredImmutable to variable declaration, similar to isDeclaredConst
• Rendered omitted loop expressions in for loops as None instead of an ExpressionStatement with None as its expression
• Added storageLocation field to variable declarations inside a variable declaration list

[CLAassistant]

All committers have signed the CLA.

[nodablock]

Would that be okay to review and merge this PR @tintinweb ?