Add sceondary offset method to Region class

osx/tools/graphtool.cpp

@@ -964,6 +964,10 @@ void Region::offset(int x, int y) {
 	}
 }
 
+void Region::offset(location off) {
+	offset(off.x, off.y);
+}
+
 void Region::setStencil(sf::RenderTarget& where) {
 	setActiveRenderTarget(where);
 	glClearStencil(0);

osx/tools/graphtool.h

@@ -68,6 +68,7 @@ public:
 	void addRect(RECT rect);
 	void clear();
 	void offset(int x, int y);
+	void offset(location off);
 	Region& operator-=(Region& other);
 };