Rework application class and framework

Make otclient's framework flexible enough to run console apps like
servers, so this mean is possible to build otclient versions without
graphical interface and use it's framework to code servers

modules/game_bugreport/bugreport.otui

@@ -1,7 +1,6 @@
 BugReportWindow < MainWindow
   !text: tr('Report Bug')
   size: 280 250
-  &onEnter: BugReport.doReport
   @onEscape: self:hide()
 
   Label