First test release.

The code in these versions mostly corresponds to the 3.5 versions of 'official' uLisp, but there are some structural differences. There is currently no ESP version, as I have no ESP board to test it; the other versions have been tested on platforms I have available. The files are presented here for ease of use purposes, and represent a snapshot at a fixed point in time.

Please note that the .ino files are build artifacts, and not the ‘preferred form’ for this code base.