Some fixes in hotkeys and other improvements

* Save last logged character and world instead of character name
* Make focused label always visible in character list and hotkeys
* Other fixes in hotkeys

modules/game_skills/skills.lua

@@ -217,7 +217,7 @@ function refresh()
 end
 
 function offline()
-  expSpeedEvent:cancel()
+  if expSpeedEvent then expSpeedEvent:cancel() expSpeedEvent = nil end
 end
 
 function toggle()