JACK Transport reposition
JACK Timebase slave: sync to JACK tempo
Changed Preferences->I/O ui, added 'Use JACK Transport' and 'Timebase Master'
JACK driver: change preferences without unload
JACK restoring audio connections
turn enum TIMESTEP into enum class TimeStep
turn enum BEAM_MODE into enum class BeamMode
turn enum FORM into enum class Form
turn enum CLEF_LINE into enum class ClefLine
turn enum OCT into enum class Oct
replace use of unnamed enum with BarLineType
turn unnamed enum into enum class CapellaType
turn enum StemDir into enum class
turn enum CapellaError into enum class Capella::Error

leaving CAP_NO_ERROR and CAP_EOF to not conflict with system headers
turn enum AskUser into enum class

although I'm not sure why a simple bool isn't enough here
turn struct TrackCol {enum} into enum TrackCol

not sure turning it into an enum class is possible or worth the effort
turn struct OperationCol {enum} into enum OperationCol

not sure turning it into an enum class is possible or worth the effort
turn unnamed enum into enum class ListItemOp

taking extra care for member DELETE not to conflict with system headers
turn unnamed enum into enum class MagIdx
turn unnamed enum into enum class NewWizzard::Page