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.
Add warning to script/server if curl does not support AsyncDNS
SPV: Improve padding and interaction counts
Merge pull request #4885 from jaywink/curl-warning

Add warning to script/server if curl does not support AsyncDNS
Merge pull request #4836 from MrZYX/message_renderer

Introduce message renderer
Merge pull request #4426 from Flaburgan/fix-padding-spv

[Ready to merge] fix padding between panels
Home page, registration page and robots.txt personnalization
Add my aspects link in the header