read actions also from /etc/polkit-1/actions

Arvin Schnell requested to merge arvin/polkit:master into master

The MR resolves #179.

Now actions are also loaded from /etc/polkit-t/actions/. It also fixes the lookup in parsed_files by using g_hash_table_lookup_extended() instead of g_hash_table_lookup(). I had the liberty to remove polkit_backend_action_pool_get_property() since it looked unused to me (so I could also not test it).

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