Fix a lot of bugs in the PC editor

- Alchemy dialog had black text on dark background
- Buttons didn't depress when clicked
- Edit XP button just said "Edit"
- Two menuitems in Special Edit menu had been left with default names
- Callbacks in Special Edit and Free Extras menu weren't correctly assigned
- Edit XP dialog put the XP to next level in the wrong place
- Fixed alchemy dialog LED naming

Supporting changes in the dialog engine:
- Getting or setting control text as a number now uses the long long type to allow maximal precision
- When adding a label to a button, the dialog's default text colour is used instead of the button's text colour if the dialog's background is dark

osx/dialogxml/control.h

@@ -91,8 +91,8 @@ public:
 	RECT getBounds();
 	void setBounds(RECT newBounds);
 	void relocate(location to);
-	long getTextAsNum();
-	void setTextToNum(long what);
+	long long getTextAsNum();
+	void setTextToNum(long long what);
 	virtual void setFormat(eFormat prop, short val) throw(xUnsupportedProp) = 0;
 	virtual short getFormat(eFormat prop) throw(xUnsupportedProp) = 0;
 	virtual void setColour(sf::Color clr) throw(xUnsupportedProp) = 0;