should make Save All faster for filetypes that support typename
highlighting, and makes the document_delay_colourise(),
document_colourise_all() functions redundant (they'll be removed in
the next commit).
Note: I'll move on_editor_expose_event() to editor.c.


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@2717 ea778897-0a13-0410-b9d1-a72fbfd435f5