- added FindClassMemberFunction which retrieves a function symbol and performs some verification.

- removed Self parameter from FxFunctionCall. Actual member function calls through an object require quite different handling so lumping these two together makes no sense.
- added a workaround to deal with ACS_NamedExecuteWithResult to both the compiler and FindClassMemberFunction. The way the ZScript compiler sets this up means that it will call the builtin, not the actual action function, so the parser needs to do some explicit check to get past the same-named action function.
- pass a proper self pointer to FxActionSpecial. Although it's still not being used, propagating design shortcuts through several function levels is a very, very bad idea.

src/scripting/codegeneration/codegen.h

@@ -888,13 +888,12 @@ typedef TDeletingArray<FxExpression*> FArgumentList;
 
 class FxFunctionCall : public FxExpression
 {
-	FxExpression *Self;
 	FName MethodName;
 	FArgumentList *ArgList;
 
 public:
 
-	FxFunctionCall(FxExpression *self, FName methodname, FArgumentList *args, const FScriptPosition &pos);
+	FxFunctionCall(FName methodname, FArgumentList *args, const FScriptPosition &pos);
 	~FxFunctionCall();
 	FxExpression *Resolve(FCompileContext&);
 };