restore old modules

* partially restore vip, battle, healthbar, skills and inventory modules
* more fixes on UIWidgets
* implement UIMiniWindow close/minimize functionality
* allow drag and drop miniwindows beteween game panels

modules/game/gameinterface.otui

@@ -1,6 +1,7 @@
 GameSidePanel < UIMiniWindowContainer
   image-source: images/sidepanel.png
   image-border: 4
+  padding: 4
 
 GameBottomPanel < Panel
   image-source: images/bottompanel.png
@@ -33,7 +34,7 @@ UIWidget
 
   GameSidePanel
     id: gameLeftPanel
-    width: 0
+    width: 190
     layout: verticalBox
     anchors.left: parent.left
     anchors.top: parent.top
@@ -66,6 +67,7 @@ UIWidget
     anchors.bottom: parent.bottom
     relative-margin: right
     margin-right: 190
+    enabled: false
     @canUpdateMargin: function(self, newMargin) return math.max(math.min(newMargin, self:getParent():getWidth() - 300), 150) end
     @onGeometryChange: function(self) self:setMarginRight(math.min(math.max(self:getParent():getWidth() - 300, 150), self:getMarginRight())) end