Link to Wall if enabled, and User talk if disabled in wall history message edits

On a wiki with Forum enabled but Message Wall disabled, on Forum thread history, when a username appears as a possessive adjective in an entry, the embedded link is to Message_Wall:[username] rather than User_talk:[username].
https://wikia-inc.atlassian.net/browse/VOLDEV-39
Cache whether wall is enabled
wfMsg -> wfMessage & globals usage

This commit replaces the use of deprecated wfMsg with wfMessage(...)->text() & prefers RequestContext to $this->app->wg->... if possible.
Escape parameters
Remove html-only messages
Fix parse error
VOLDEV-53 - Add alias file for new Special:ListUsers redirects
fix error
+dutch translations
add title attribute to forum activity module links
Merge branch 'dev' into VOLDEV-39

Conflicts:
	extensions/wikia/Wall/Wall.i18n.php
enforced VOLDEV-39 changes, +wn-newmessage
VOLDEV-50 Activate buttons after changing badge

Reenable the input elements after changing/reverting a badge on Special:AchievementsCustomize + assorted code linting
VE-969 Script for forcing Visual Editor by WAM score
VE-969 Script for forcing Visual Editor by WAM score
VE-969 Changes from code review
VE-969 Fix incorrect value being compared
VE-908 Initial mega-commit of VisualEditor upstream
VE-908 Remove extra parenthesis
VE-908 Manual merge of Wikia changes
Tweaks to previous merges
 * Simplify noProxy check for development environment
 * Use wfUrlencode for POST also
 * Remove previously merged animation options for toolbar and surface