Dean Troyer 15fe0fae17 Add plugin interface version
External plugins need to know which plugin interface is being
used by the host OSC.  Releases <1.6 (?) will not have a
version defined.

Plugins can add the following to their make_client() to discover
the interface version:

    _plugin_interface_version = getattr(
        instance,
        "PLUGIN_INTERFACE_VERSION",
        None,
    )

Change-Id: Ifc0f40fec5bc27f6425139984936b7f6e032a580
2015-07-22 11:06:41 -05:00
..
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