Previously rf_mode was static parameter of particular software - it was
possible to instantiate cells only of the mode selected for particular template.

In MultiRU it will be possible to generally instantiate all kind of cells -
LTE/NR and TDD/FDD all at the same time.

-> Switch rf_mode to be runtime parameter as a preparatory step for that.

Software for ORS becomes just software-ors.cfg with software-tdd-ors.cfg
providing backward compatibility proxy as we have many ORS'es currently
deployed with that software-release URL. For other softwares backward
compatibility is not preserved including for software-fdd-ors.cfg because we
practically have very few deployments with those.

To show tdd_ul_dl_config only for TDD we use conditional feature of new JSON-editor.

Backward compatibility: nothing changes for ORS, for everything else rf_mode
now needs to be explicitly set in cell parameters if it is not TDD.

Rendered enb.cfg and gnb.cfg stay the same.