some cleanup in modules, fixes in tooltip, uiwidget warnings, disable map saving for a while

modules/client_about/about.lua

@@ -9,7 +9,7 @@ function About.init()
 end
 
 function About.display()
-  aboutWindow = displayUI('about.otui', { locked = true })
+  displayUI('about.otui', { locked = true })
 end
 
 function About.terminate()

modules/client_about/about.otmod

@@ -8,5 +8,5 @@ Module
     require 'about'
     About.init()
 
-  onUnload:
+  onUnload: |
     About.terminate()