fix Now overflow on windows

fix Now for Windows

The starting point of QueryPerformanceCounter is not defined and may
roll-over to the negative side, even though it's unlikely to iterate
over the whole range during our lifetimes. Calculate the delta compared
to qpc start instead of converting the absolute qpc value, which may
turn negative.

_example/benchtime: fix plotting

hrplot: update plot to latest

bump version

bump version

remove beta marking

hrplot: update dependency to v1.0.0