Fix Imager Text Notes

In testing Gehn.20 beta, it was noticed that text notes always appear from the game master. For some silly tail reason, uploads to the imager were gated behind the game master. This is stupid because the game master can simply act upon vault operations dispatched to everyone in the age. This has been rectified. As a bonus, we now clear the imager to black when receiving "cleardaImager".

Don't worry about compatibility with MOULa--in mine and kae's testing, if a non-game master sends anything to an imager, the game master crashes and the upload is thrown away. This change would probably fix the MOULa crash as well, but I'm not interested in porting anything sort of a total rewrite of this nonsense to OU.