highlighting colors' pref, instead of requiring a restart.
Remove filetypes.common invert_all option - use 'Invert syntax
highlighting colors' pref instead (closes #2854525).



git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@4184 ea778897-0a13-0410-b9d1-a72fbfd435f5