* Add role to disable/enable channel preview

* Add message to inform user

* Added view-d-room to guest role

So they can see direct messages.

* valueChanged optimization

valueChange checks if the text is rtl or ltr on every input, changed the method to check only the first input.

* Update startup.coffee

* Fixes pr #4049

fixes the value.lenght to value.length and used the this.value instead of the value in the parameter

* Update chatMessages.coffee

* Update startup.coffee

* Update startup.coffee

* Fix multiple notifications (resolve #3517) and close after click

* Fix replacing notification for different messages from the same room

* Add Sandstorm activity/notification events

* Update meteor-spk version

* fix video message button always shown while typing

* fix exception when closing videomsg dialog if video wasn't started

* fix typo in code enabling video message feature

Fixes #3697.