Merge pull request #4844 from svbergerem/new-publisher-fix-button-height

Fix different button sizes in new publisher
Show hovercards in the notification drop-down for users on the same pod
Fix atom feed for reshares of deleted posts.

Propose for fix #4638

Added Changelog line

Added Specs for testing if the reshared origin post is deleted and therefore not shown in the atom feed
Merge branch 'MatrixCrawler-4638-Atom-Feed-Error' into develop
Merge pull request #4843 from svbergerem/4228-hovercards-same-pod

Show hovercards in the notification drop-down for users on the same pod

Conflicts:
	Changelog.md
Fix publisher broken after jquery upgrade
Fixed #4726 infinite photo stream
Merge pull request #4845 from Flaburgan/fix-mention-publisher

Fix publisher broken after jquery upgrade
Add handle indication on search page, improve design
Check if the hashtag is a link in function .hashtagify
Fixed #4693
Introduce message renderer

This new class replaces all existing server side message
rendering helpers and is the new global entry point for such
needs. All models with relevant fields now expose an instance
of MessageRenderer for those. MessageRenderer acts as
gateway between the existing processing solutions for markdown,
mentions and tags and provides a very flexible interface for
all output needs. This makes the API to obtain a message
in a certain format clear. As a result of centralizing the
processing a lot of duplication is eliminated. Centralizing
the message processing also makes it clear where to change
its behaviour, add new representations and what options
are already available.
Merge pull request #4787 from hincupetru/4726-infinite-photo-stream

Added limit by max_time to photos#index for prevent "infinite photo stream"
Merge pull request #4794 from Flaburgan/improve-search-page

Add handle indication on search page, improve design
Merge pull request #4847 from hincupetru/3692-hashtags-inside-markdown-link

Solved problem with hashtags inside markdown links
Merge pull request #4853 from hincupetru/4693-notifications-hovercard-avatars-misaligned

Fixed "hovercard avatars misaligned in notifications drop-down"
Revert "Merge pull request #4847 from hincupetru/3692-hashtags-inside-markdown-link"

This reverts commit 06ab49862059e5076eb88180e7f182194bcd8ebe, reversing
changes made to 3c4d8d95d3a94bc3eec43793982977d50d5854b5.

Conflicts:
	Changelog.md
Check if the hashtag is a link in function .hashtagify
Merge pull request #4856 from hincupetru/3692-hashtags-inside-markdown-link

Check if the hashtag is a link in function .hashtagify
I save textarea value before rendering comments when clicked 'show more..'