Parser.parseFunctionDeclaration

Parses a FunctionDeclaration

$(GRAMMAR $(RULEDEF functionDeclaration): ($(RULE storageClass)+ | $(RULE _type)) $(LITERAL Identifier) $(RULE parameters) $(RULE memberFunctionAttribute)* ($(RULE functionBody) | $(LITERAL ';')) | ($(RULE storageClass)+ | $(RULE _type)) $(LITERAL Identifier) $(RULE templateParameters) $(RULE parameters) $(RULE memberFunctionAttribute)* $(RULE constraint)? ($(RULE functionBody) | $(LITERAL ';')) ;)