restore some game functionallity

* i'm gradually restoring game functionality with the new modules design, though still a lot to do
* you can reload all scripts and modules using Ctrl+R shortcut while playing (finally! this is the reason of all this rework)
* a bunch of fixes, but new regression too :P
* fix performance issue that could lead freezes in the client in older machines
* completely new game module with new design
* fix crashs in map render
* remove uigame.cpp (now every game input is via lua)
* enable DEBUG macro by default, with it you are able to view any possible lua leak while running

modules/game/widgets/uiitem.lua

@@ -0,0 +1,78 @@
+function UIItem:onDragEnter(mousePos)
+  if self:isVirtual() then return false end
+
+  local item = self:getItem()
+  if not item then return false end
+
+  self:setBorderWidth(1)
+
+  self.parsed = false
+  self.currentDragThing = item
+  Mouse.setTargetCursor()
+  return true
+end
+
+function UIItem:onDragLeave(droppedWidget, mousePos)
+  if self:isVirtual() then return false end
+
+  if not self.parsed then
+    self.currentDragThing = nil
+  end
+
+  Mouse.restoreCursor()
+  self:setBorderWidth(0)
+  return true
+end
+
+function UIItem:onDrop(widget, mousePos)
+  if self:isVirtual() then return false end
+
+  if not widget or not widget.currentDragThing then return true end
+
+  local pos = self.position
+  local count = widget.currentDragThing:getCount()
+  if widget.currentDragThing:isStackable() and count > 1 then
+    widget.parsed = true
+    local countWindow = createWidget('CountWindow', rootWidget)
+    local spinbox = moveWindow:getChildById('spinbox')
+    spinbox:setMaximum(count)
+    spinbox:setMinimum(1)
+    spinbox:setCurrentIndex(count)
+
+    local okButton = moveWindow:getChildById('buttonOk')
+    okButton.onClick = function()
+      g_game.move(widget.currentDragThing, pos, spinbox:getCurrentIndex()) okButton:getParent():destroy()
+      widget.currentDragThing = nil
+    end
+    moveWindow.onEnter = okButton.onClick
+  else
+    g_game.move(widget.currentDragThing, pos, 1)
+  end
+
+  self:setBorderWidth(0)
+  return true
+end
+
+function UIItem:onHoverChange(hovered)
+  if self:isVirtual() then return end
+
+  local draggingWidget = g_ui.getDraggingWidget()
+  if draggingWidget and self ~= draggingWidget then
+    local gotMap = draggingWidget:getClassName() == 'UIMap'
+    local gotItem = draggingWidget:getClassName() == 'UIItem' and not draggingWidget:isVirtual()
+    if hovered and (gotItem or gotMap) then
+      self:setBorderWidth(1)
+    else
+      self:setBorderWidth(0)
+    end
+  end
+end
+
+function UIItem:onMouseRelease(mousePosition, mouseButton)
+  if self:isVirtual() then return false end
+
+  local item = self:getItem()
+  if not item or not self:containsPoint(mousePosition) then return false end
+  return g_game.processMouseAction(mousePosition, mouseButton, nil, item, item, nil, item)
+end
+