Fix text notes appearing from the Game Master.

This must have been an eap change. It's absolutely insane for that to be
gated by the game master--the game master can EASILY act on the vault node
ref add.

Bonus: I removed dead VaultNotify things.
Make 'cleardaImager' clear the imager to black.

So it DID clear the imager folder, but it did NOT actually clear the
current display, which implies brokeness. Really, we need a better way to
clear imagers than sending a hack text note.
Merge pull request #86 from Hoikas/imager

Fix Imager Text Notes