Added function for escaping query strings and fixed several XSRF vulnerabilities.
Fixes #6177 - refuse to deactive plugins used as dependencies
whitespace fix
move deactivate event registration to the user-triggered action
forward to all if no group archive requested
Merge pull request #6151 from jdalsem/patch-9

Forward to list of all group blogs if archive not requested
fixed a unittest I broke in #398
invalidate the subtype_cache when removing a subtype
ElggSite->getURL() returns the site url instead if view/<guid>
remove thumbnails if no longer needed
as request by mrclay return a boolean
changed the bugtracker url from the developers plugin to GitHub
fixed issue when reordering plugins to second last position of other
column that has more than 2 widgets
Merge pull request #6170 from jeabakker/removed-link-to-trac

Removed Trac from developers plugin manifest
replaced all references to trac.elgg.org to the correct GitHub issues
found some more references to trac
Revert "move deactivate event registration to the user-triggered action"

This reverts commit 6da43b70ca0de807c0532adb0bba65405d3ffbc1.
Added comments regarding deactivation due to error
Merge pull request #6174 from jeabakker/6172-replace-references-to-trac-elgg-org

replace all references to trac.elgg.org to the correct GitHub URLs
Merge pull request #6155 from jeabakker/fix-broken-unittest-from-398

fixed a unittest I broke in #398