This merge request adds a monotonic time function to epicardium and pycardium as discussed in #146 (closed).
The monotonic time is maintained by accumulating an offset to the RTC every time it is changed.
Epicardium APIs added:
Pycardium APIs added:
It also fixes the decoding function from subseconds to milliseconds in
epic_rtc_get_milliseconds(). The previous version was not numerically stable. See explanation in the commit message of 756c13df.