Extract and merge the delete drafts (posts or PMs) code

Signed-off-by: emanuele <emanuele45@gmail.com>
Some remnants of useless code

Signed-off-by: emanuele <emanuele45@gmail.com>
Extract some common code from the two draft actions + $memID moved to a nice private variable of the Draft_Controller class

Signed-off-by: emanuele <emanuele45@gmail.com>
Move feed and alike xml outputs to the template

Signed-off-by: emanuele <emanuele45@gmail.com>