add skeleton/martian/bugman/fishman/lizardman to character customization

[babayetu83]

This was trialled before with the Lizard trait.

The fallout from that leads me to consider this only with a resounding 'no'.

i think that could be smoothed over by having "all nanotrasen employees (read: the crew, including jimmy the martian janitor or skeleton sam) are to be considered human included in law 1