questions: what is mutable / immutable?
what is the distinction between TimeValue and Time ?
what conversions make sense?
what mutations / operators to support?
namespace lib::time
lumitime.cpp will define the basic time wrapper
quantiser.cpp the grid alitnment and formatting wrapper
header for
- timevalues / ranges
- quantised time valuse
- timecode valuse
"lumitime.hpp" will contain the interface facilities
