prevent conflicts with other tags whilst keeping the same first word
as core function names, and update plugins to use them.
The old plugin macros are still available, but will be removed
after the next release.
Compiling with -DGEANY_DISABLE_DEPRECATED in CFLAGS will disable
the old macros.
git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@2195 ea778897-0a13-0410-b9d1-a72fbfd435f5
