this is the first building block in an attempt to
protrect against time wraparound. The intention is
not to be airtight, but practically effective.
A really airtight solution would require writing
our own SafeInt class
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