Monospaced preferences now display in Remarkup areas

Summary: Fixes T6109, Ref T6654. Correctly clobbers the Remarkup defaults.

Test Plan:
Tested with Copperplate!

{F239347}

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6109, T6654

Differential Revision: https://secure.phabricator.com/D10905
Merge branch 'master' of github.com:phacility/phabricator

* 'master' of github.com:phacility/phabricator:
  Monospaced preferences now display in Remarkup areas
Support for branches & tags in SVN repositories

Supported:
----------
- SVN branch/tag discovery ("Subversion > Layout" setting) must be enabled manually for each repository
- SVN branches in "diffusion.branchquery" Conduit call
- SVN tags in "diffusion.tagsquery" Conduit call
- SVN branches/tags are recognized as Refs in a repository with all associated functionality (e.g. showing branches/tags on repository home page, ability to browse a specific branch/tag only, etc.)
- names of actual folders for "trunk", "branches" and "tags" can be set what's actually used in the repository in "Subversion > Edit" section
- display of branches/tags on commit detail page

Not Supported:
--------------
- import only commits from tracked branches (right now all commits are imported)