Add Clock, implementing proper monotonic and wallclock time using Instant (sec + nsec), currentTimeMillis() is also monotonic now, reused by Platform. Dropped Platform.currentTimeMicros()

Clock and its implementation was copied from jaulibs, a spin-off from Direct-BT.

The implementation uses `clock_gettime(CLOCK_MONOTONIC, &t)` and is considered safe and high-performant
as it avoids a kernel call via VDSO (GNU/Linux).

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