e_dbus: Use idler instead of idler_enterer

e_dbus: Use idler instead of idler_enterer

Instead of using an idle_enterer to process D-Bus messages, use an
idler that does not require creating a dummy event and wakeup the main
loop on every interation.

Remove a callback function to wake up the main loop when there is a message
in queue.

Patch by: José Roberto de Souza  <zehortigoza@profusion.mobi>

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/e_dbus@73371 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33