for #67 it wasnt saving the unicodes

when the user added one, now it saves to the users preferences so if they re-load the page it will show and it will be immediately drag and dropable
fixes #1354 added the tipa to the find and replace for escape latex from #860
unhiding the edit unicode tipa dialogs for #1354
found bug which was causing the unicode dropdowns to show #759

probably introduced in
Bug in twitter bootsrap on android webviews, cant click in dropdowns
upping version to 1.93.0 for release