Use the user image for BBB avatar #2 (Limit image size) (#2860)

* Update bbb_server.rb

* Update bbb_server.rb

* showing user avatar

To make sure something unexpected happens

* revert if current_user due to the undefined error

* Update bbb_server.rb

'if current_user' should not have problem, but rubocop complains...

* Update bbb_server.rb

* add an option to avatar image

* Add an option to avatar image

* add an option avatar_image

* Update rooms_controller.rb

* Update joiner.rb

* Update bbb_server.rb

* Update joiner.rb

* Update joiner.rb

* Update rooms_controller.rb

* Update joiner.rb

* Update sample.env

* Update application_helper.rb

* Update rooms_controller.rb

* Update joiner.rb

* Update bbb_server.rb

* Update application_helper.rb

Add a check if the URL is valid.

* double the limit

* move the judgement to controller

* Update joiner.rb

* Update rooms_controller.rb

* Update application_helper.rb

* Update rooms_controller.rb

* Update application.rb

* Update joiner.rb

* Update rooms_controller.rb

* Update joiner.rb

* Update rooms_controller.rb

* Update application_helper.rb

* Update application.rb

* in case parameter not set

* change to MAX_AVATAR_SIZE

* Notification default value

Co-authored-by: Jesus Federico <jesus@123it.ca>
Co-authored-by: Ahmad Farhat <ahmad.af.farhat@gmail.com>