IFDistributor implementation complete. (#218)

* Issue #210. Created a generic IFDistributor interface.
Also, reworked the original SRT IFDistributor from `ifdistributor`
branch in order to inherit from the generic interface.

* Fix #210, implemented the new IFDistributor component.
Also wrote its default configuration and renamed the old IFDistributor to SRTIFDistributor14.

* Fix #210. Possible final implementation of IFDistributor component.
The component has been tested with the new simulator,
but it needs to be tested with the actual hardware before merging this branch.

* Fix #210, some minor bugs fixed. Also added attribute `N_BOARDS` in schema.

* Fix #210. Added methods documentation and fixed some logging messages.

* Fix #210, edit according to proposed changes.