Fixed mask for image fields, added mask support to slice window

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@243 0fc631ac-6414-0410-93d0-97cfa31319b6

src/data/field/image.cpp

@@ -28,6 +28,10 @@ IMPLEMENT_REFLECTION(ImageStyle) {
 	REFLECT_N("mask", mask_filename);
 }
 
+bool ImageStyle::update(Context& ctx) {
+	return Style       ::update(ctx)
+	     | mask_filename.update(ctx);
+}
 
 // ----------------------------------------------------------------------------- : ImageValue