major UIWidget rewrite with new features

modules/addon_mapeffects/mapeffects.lua

@@ -2,13 +2,15 @@ MapEffects = {}
 
 function MapEffects.init()
 --[[
-  local box = createWidget('ComboBox')
-  box:moveTo({x=100, y=8})
+  local box = createWidget('ComboBox', 'leftButtonsPanel')
+  box:addAnchor(AnchorLeft, 'prev', AnchorRight)
+  box:addAnchor(AnchorTop, 'parent', AnchorTop)
+  box:setMargin(6, 6)
   box:addOption('Normal')
   box:addOption('Bloom')
   box:addOption('TV')
   displayUI(box)
-  ]]--
+]]--
 end
 
 function MapEffects.terminate()