Refactoring and flexibility changes

* Split game module into game and game_interface
* Move core_lib to corelib
* Move miniwindow to corelib
* Introduce init.lua script for initializing the client, giving much more flexibility
* OTClient is no longer Application derived and is much simpler

modules/corelib/widgets/uiprogressbar.lua

@@ -0,0 +1,35 @@
+UIProgressBar = extends(UIWidget)
+
+function UIProgressBar.create()
+  local progressbar = UIProgressBar.internalCreate()
+  progressbar:setFocusable(false)
+  progressbar:setPhantom(true)
+  progressbar.percent = 0
+  progressbar:updateBackground()
+  return progressbar
+end
+
+function UIProgressBar:setPercent(percent)
+  self.percent = math.max(math.min(percent, 100), 0)
+  self:updateBackground()
+end
+
+
+function UIProgressBar:getPercent()
+  return self.percent
+end
+
+function UIProgressBar:getPercentPixels()
+  return 100 / self:getWidth()
+end
+
+function UIProgressBar:updateBackground()
+  local width = math.round(math.max((self.percent * self:getWidth())/100, 1))
+  local height = self:getHeight()
+  self:setBackgroundSize({width=width, height=height})
+end
+
+
+function UIProgressBar:onGeometryChange(oldRect, newRect)
+  self:updateBackground()
+end