Remove all references to application specific (ADC, TDC, FD) from code,
in order to generalize the library.

Major changes include:

- removal of application-specific initialisation and channel enabling code
- removal of libwrtd-devices.c
- removal of struct wrtd_mt_config
- addition of fields to wrtd_root in order to be able to dynamicaly
  retrieve information that was previously stored in wrtd_mt_config
- static names and numbering for local channels: local inputs are named
  LC-I<n>, local outputs are named LC-O<n>. Numbering (<n>) starts from
  device 0 of cpu 0 and increases, with a separate counter for inputs
  and outputs.
- rework of source and destination CPU calculation to handle cases where
  multiple CPUs are capable of network RX/TX
- update firmware to reflect the above changes

TODO:

1. Remove hard-coded FMC-ADC values from WRTD testbench classes
2. Make it work for more than one rules
3. Finalise support for alarms
4. Add support for accessing the logs

From Dimitris.

From Milosz.