resolve
fun resolveMemberCallee(callee: DeclaredReferenceExpression, curClass: RecordDeclaration?, call: CallExpression): List<FunctionDeclaration>
Resolves a CallExpression.callee of type MemberExpression to a possible list of FunctionDeclaration nodes.
TODO: Change callee to MemberExpression, but we can't since resolveReferenceCallee somehow delegates resolving of regular function calls within classes to this function (meh!)