Add motorised attribute to DeviceInfo for generic MIDI maps so that

Add motorised attribute to DeviceInfo for generic MIDI maps so that
we can specify if a surface is motorised, and as such will keep its
phyiscal controls in sync with Ardour's controllables at all times.
If this is not the case, we enable the code to avoid jumps when controls and
controllables are out of sync.  Mark the BCF2000 as motorised.

git-svn-id: svn://localhost/ardour2/branches/3.0@11611 d708f5d6-7413-0410-9779-e7cbd77b26cf