Usability updates to IDE settings and settings.h

Prebuild.bat is not cross-platform, and the functionality is superseded by the newer version of version.py .
This change is reflected in the removal of several truant files, and an edit to the prebuild step in the IDE config.

This request will critically depend on the following pending pull request to imageproc-lib, since the version.py there is changed:
https://github.com/biomimetics/imageproc-lib/pull/69

Also, radio_settings.h was removed. All radio settings are now located in settings.h. Issues with changing names for the macros there have been fixed.

Note the addition of several TODO items around hard-coded destination addresses for radio communication, which should be with respond-to-sender code.