Update custom emojis in real time

Closes #4391

Add source-type for stable release of snap

Fix popout mode for livechat

Replace fontello by svg icons

Livechat fixes for 0.40

Use users' timezone when searching on dates

Show file type on file upload error.

Allow Iframe login with default tokens

Fix #3217

Use loginToken instead of token

Fixing typo on Change Channel Topic

Irrelevant `else`

Corrects typos in language strings

There is no need to use the `else` since the `if` statement returns implicitly.

Added setting to allow the sending of unrecognized slash commands

Move livechat bundled assets to root app

Display SMTP error messages instead of Internal Server Error

Improve outgoing/incoming webhook logs

Only try to auto orient jpeg, png and bmp files

Closes #2837

Closes #4194