remake ui event system and reimplement line edit

modules/core_ui/windows.otui

@@ -17,4 +17,5 @@ Window < UIWindow
       border.top: 0
 
 MainWindow < Window
-  anchors.centerIn: parent
+  anchors.centerIn: parent
+  onLoad: function(self) self:lock() end

modules/mainmenu/ui/infowindow.otui

@@ -41,6 +41,7 @@ MainWindow
       anchors.bottom: parent.bottom
       margin.bottom: 9
       margin.right: 9
+      onClick: displayErrorBox("Error", "Not implemented yet")
 
   HorizontalSeparator
     anchors.left: parent.left

modules/mainmenu/ui/mainmenu.otml

@@ -1,47 +0,0 @@
-Panel
-  skin: mainMenuBackground
-  anchors.left: parent.left
-  anchors.right: parent.right
-  anchors.top: parent.top
-  anchors.bottom: parent.bottom
-
-  Panel
-    id: mainMenu
-    skin: roundedGridPanel
-    size: 144 162
-    anchors.left: parent.left
-    anchors.bottom: parent.bottom
-    margin.left: 60
-    margin.bottom: 70
-
-    Button
-      id: enterGameButton
-      text: Enter Game
-      anchors.top: parent.top
-      anchors.horizontalCenter: parent.horizontalCenter
-      margin.top: 18
-      onClick: rootWidget:addChild(loadUI("entergamewindow"))
-
-    Button
-      id: optionsButton
-      text: Options
-      anchors.top: prev.bottom
-      anchors.horizontalCenter: parent.horizontalCenter
-      margin.top: 10
-      onClick: rootWidget:addChild(loadUI("optionswindow"))
-
-    Button
-      id: infoButton
-      text: Info
-      anchors.top: prev.bottom
-      anchors.horizontalCenter: parent.horizontalCenter
-      margin.top: 10
-      onClick: rootWidget:addChild(loadUI("infowindow"))
-
-    Button
-      id: exitGameButton
-      text: Exit
-      anchors.top: prev.bottom
-      anchors.horizontalCenter: parent.horizontalCenter
-      margin.top: 10
-      onClick: exit()

modules/mainmenu/ui/optionswindow.otui

@@ -28,6 +28,7 @@ MainWindow
     anchors.top: parent.top
     margin.left: 18
     margin.top: 65
+    onClick: displayErrorBox("Error", "Not implemented yet")
 
   Label
     text: |-
@@ -45,6 +46,7 @@ MainWindow
     anchors.top: parent.top
     margin.left: 18
     margin.top: 98
+    onClick: displayErrorBox("Error", "Not implemented yet")
 
   Label
     text: Customise the console
@@ -60,6 +62,7 @@ MainWindow
     anchors.top: parent.top
     margin.left: 18
     margin.top: 131
+    onClick: displayErrorBox("Error", "Not implemented yet")
 
   Label
     text: Edit your hotkey texts
@@ -83,6 +86,7 @@ MainWindow
     anchors.bottom: parent.bottom
     margin.left: 18
     margin.bottom: 60
+    onClick: displayErrorBox("Error", "Not implemented yet")
 
   Label
     text: |