Implemented Tile, WangSet and WangColor properties

Now all built-in properties are present, apart from some loose ends.

* Added RectEdit / RectEditorFactory (QRect values)
* Added Property::toolTip (set on label and editor, but currently not
  functional on label due to the eliding tool tip logic)
* Added change events to fix updating of WangSet and WangColor properties
  (was already broken with old framework)

src/libtiled/wangset.h

@@ -424,5 +424,6 @@ TILEDSHARED_EXPORT WangSet::Type wangSetTypeFromString(const QString &);
 
 } // namespace Tiled
 
-Q_DECLARE_METATYPE(Tiled::WangSet*)
 Q_DECLARE_METATYPE(Tiled::WangId)
+Q_DECLARE_METATYPE(Tiled::WangSet*)
+Q_DECLARE_METATYPE(Tiled::WangSet::Type)

src/tiled/changeevents.h

@@ -61,6 +61,7 @@ class ChangeEvent
         WangSetRemoved,
         WangSetChanged,
         WangColorAboutToBeRemoved,
+        WangColorChanged,
     } type;
 
 protected:
@@ -277,17 +278,20 @@ class WangSetChangeEvent : public ChangeEvent
 {
 public:
     enum WangSetProperty {
-        TypeProperty            = 1 << 0,
+        NameProperty,
+        TypeProperty,
+        ImageProperty,
+        ColorCountProperty,
     };
 
-    WangSetChangeEvent(WangSet *wangSet, int properties)
+    WangSetChangeEvent(WangSet *wangSet, WangSetProperty property)
         : ChangeEvent(WangSetChanged)
         , wangSet(wangSet)
-        , properties(properties)
+        , property(property)
     {}
 
     WangSet *wangSet;
-    int properties;
+    WangSetProperty property;
 };
 
 class WangColorEvent : public ChangeEvent
@@ -303,4 +307,24 @@ class WangColorEvent : public ChangeEvent
     int color;
 };
 
+class WangColorChangeEvent : public ChangeEvent
+{
+public:
+    enum WangColorProperty {
+        NameProperty,
+        ColorProperty,
+        ImageProperty,
+        ProbabilityProperty,
+    };
+
+    WangColorChangeEvent(WangColor *wangColor, WangColorProperty property)
+        : ChangeEvent(WangColorChanged)
+        , wangColor(wangColor)
+        , property(property)
+    {}
+
+    WangColor *wangColor;
+    WangColorProperty property;
+};
+
 } // namespace Tiled

src/tiled/colorbutton.cpp

@@ -75,6 +75,7 @@ void ColorButton::pickColor()
 
 void ColorButton::updateIcon()
 {
+    // todo: fix gray icon in disabled state (consider using opacity, and not using an icon at all)
     setIcon(Utils::colorIcon(mColor, iconSize()));
 }