Moved (custom)frame-related code to a dedicated module

- (custom)frame-related code (frame building) has moved to
modules/customFrameBuilder_module.(h/cpp). Exported functions have been
limited to buildcustomFrame(), that builds all the frame using
global variables exported by sensors_module.h, ...
- sensorStringXXX variables have been renamed to customFrameXXX
- project properties and HAO-tracker's main have been changed
according to this refactoring