break C API to drop deprecated stuff

Submitted by Simon McVittie

Assigned to Telepathy bugs list

When we break D-Bus API we should also break C API:

remove tp_get_bus (Bug #18832)
don't emit TpProxy::invalidated in dispose (Bug #22119)
remove all run methods (Bug #22207)
don't allow get_contact_statuses to fail (Bug #21796)
get rid of everything deprecated
replace TpChannelManagerIface.foreach_channel_class with a renamed TpChannelManagerIface.type_foreach_channel_class
replace the two original TpClientChannelFactory methods with a renamed obj_*
return void from tp_proxy_add_interface_by_id (Bug #21795)

Other possible things:

get TpContact objects in a more GIO-ful way (Bug #27687), although this might be superseded by fixing handles
make all async functions not re-enter (using an idle if necessary)
check everything for introspectability and fix troublesome APIs as much as possible

Possibly to do, or not, depending how long the above take:

cut as much as possible of the dbus-glib out of our API/ABI
move to GDBus, which is probably also an ABI break, but might have to be delayed if the above take too long (Bug #28782)

Version: git master