Finally added function to escape html entities.

I noticed the GUI search never tells you what you are searching for...
Need to fix that.
Many changes... See following comment.

Actually made dialogs for login success/failure.
Fixed LoginGUI saving usernames.
GUI search tells you what you are searching for and cancel button has been renamed to fit better.
Added a button to start and stop syncing
Added the ability to stop a sync, then resume later
ItemPanes resize their text correctly again.
MangaItems should now always have a chapter associated with them when being sent to the ui.