refactore: get rid of g_hash_table* calls in user_settings

Related to abrt/abrt#594

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>
refactor: add functions for custom application conf

Related to abrt/abrt#594

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>