made marker file lock use append, not truncate

* Fix mute button.

* Switch mute to use task id.
reviewed with Simon

* Change text of dialog
* Add callback for mute button
reviewed with Richard and Widely.

* Add the newer run time permissions to the viewer
* Filter requested permissions by those the viewer knows about
* Show a dialog indicating unknown permissions were requested and a new viewer
  will be needed to grant them.
reviewed with Simon and Soft

MAINT-2613: remove duplicate entry for "DisablePrecacheDelayAfterTeleporting", and fix a few other llsd validity problems

FIX INTL-114 translation for 9 languages of major update from CHUI (based on latest merge with viewer-development)

Integrated Nicky Dasmijn's patch to handle the unicode file paths properly.
Code reviewed, patch was clean.
Tested locally, correctly allows wearables to load where they would fail before.
Should be ready for automated build & QA.

OPEN-173 FIX FMODEx Music stutters once every few seconds (OSS patch via Latif Khalifa & Siana Gearz) - additional fix. Team City gave me the wrong MD5 for 3p-package

OPEN-173 FIX FMODEx Music stutters once every few seconds (OSS patch via Latif Khalifa & Siana Gearz)