Emoji Rendering: Render emoji throughout vanilla

Add emoji rendering to formatting functions.
Check if emoji is enabled before translating.
Dashboard: Css for video embeds.

Fixes issue where video embed extends outside of 
holding container in Firefox.
Dashboard: Add CSS rule for BestOf page for iframe embeds.
Merge pull request #2328 from vanilla/hotfix/css-responsive-ish-embeds

Dashboard: Css for video embeds.
Merge pull request #2300 from vanilla/hotfix/render-emoji-everywhere

Emoji Rendering: Render emoji throughout vanilla
Merge pull request #2278 from vanilla/hotfix/allow-profile-edit

Clean up the profile edit button checking.
Merge branch 'master' of github.com:vanilla/vanilla into stage

Conflicts:
	library/core/class.format.php