Rename project-dialog-create signal to project-dialog-open because now
the dialog exists all the time and the signal name is misleading. Add
project-dialog-close signal to indicate that project dialog has been closed
and plugins can remove their tabs when needed.
In addition, bump plugin API and ABI version.
pointer syntax instead of @signaldef as this puts a summary of
the signal names at the top of the page and sorts alphabetically.
(Note: the syntax is similar to Vala signal syntax).
git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@5065 ea778897-0a13-0410-b9d1-a72fbfd435f5