Further work on #71 :
- Added config code to fdrs_functions.h.
- Commented all local config settings -> global config settings will be taken by default.
- added a debugConfig function, to check from where settings have been taken. May be moved to a place where sensors and gateways can share code as this is needed only once. For the sake of simplicity the function made it into fdrs_sensor.h and fdrs_functions.h Needs to be refined, as there is redundancy right now.
Changed those values to be prevent compiling issues with PlatformIO and also as it is good practice not to use names which easily could collide with other libs.
Also removed a duplicate line from keywords.txt
