Add get_line_end_position(), set_target_start(), set_target_end(), replace_target() to the plugin API (patch by Eugene Arshinov, thanks).
Add new plugin signal: "document-filetype-set" (closes #2852286).

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@4162 ea778897-0a13-0410-b9d1-a72fbfd435f5