Closes #143, Add more epics variables to the edc.
Adds in 3 new epics variables to the edc. If selected in the edc ini file they are always available.
- prefix UPTIME_SECONDS
- prefix DATA_RATE_KB_PER_S
- prefix GPS
Their data is also exported in the json debug dump as the following fields:
- Uptime
- DataRateKbPerSec
- Gpstime