Remove unused file
#931 Fix jQuery loading failure
#932 Improve Users online count
#923 Remove active state from plugin pages
#921 Fix Quote list style issues
#920 Fix login interface issues
#936 Update YouTube embedding
#934 Show "Last edited by" again
Fix default avatar not showing.
Merge pull request #938 from oldhobbyist/fix-default_avatar

mbbdev / lunadev branches - Fix default avatar not showing.
#939 Fix vulnerability in ModernBB
Drop unused file
#935 Fix alignment issues in search results
#940 Fix issues with update check
#924 Tag ModernBB 3.5.1