add two new ezc statements: [if-def ...] and [if-not-def ...]

[if-def my_function] returns true if my_function is defined somewhere (either a model, model container, space, date, block, function or variable)
add support for "noescape" or "raw" parameters to Space fields
fixed: CallWrapper() didn't return a status if a model/space/date/container was found

src/patternparser.h

@@ -176,6 +176,8 @@ private:
 	bool ReadFunction(Item & item);
 
 	void ReadDirectiveIf(Item & item);
+	void ReadDirectiveIfDef(Item & item);
+	void ReadDirectiveIfNotDef(Item & item);
 	void ReadDirectiveEnd(Item & item);
 	void ReadDirectiveElse(Item & item);
 	void ReadDirectiveFor(Item & item);