Initial support for Pages

Fails to suppress dead key. Causes errors in Pages if you poke it too much.
Find word using wordRe

The editor’s word-finding routine doesn’t extend to all Vietnamese characters.
Go through the editor instead of the text storage

Now changes can be saved and undone, and they no longer trigger crashes.
Don’t send input event to iCloud input fields

Fixes #36.
Merge branch 'toiLamViec'