Support adding custom filetype files e.g. filetypes.Foo.conf.
- Code:
Allow GeanyFiletype::extension to be NULL.
Add note about using GeanyFiletype pointer instead of filetype_id
for filetypes.c function arguments.
Replace styleset_none() with styleset_default().



git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@4143 ea778897-0a13-0410-b9d1-a72fbfd435f5