Added RTC support and example project.
Removed unnecessary forward declaration in the Timer class.
Renamed Rtc to SleepTimer.
Renamed test-rtc to test-sleepTimer.
Updated the board, drivers, kernel and library folders.
Minor fixes in various projects.
Added test-radioTimer project.
Removed unnecessary include in the Ethernet class.
Merge branch 'master' into 'OpenDQ'.
Updated the OpenDQ project.
Updated the RadioTimer and SleepTimer implementation.
Updated the CI infrastructure.
Updated the test-radioTimer and test-sleepTimer projects to match the new interface.
Merge branch 'master' into OpenDQ.