Description of the new feature / enhancement

Add configuration support for the various fuel tanks and engines to run off of Ethanol, Ethanol 75, or Ethanol 90 with either Liquid Oxygen or HTP.

Proposed technical implementation details

See this for propellant specifics.

Will likely need MM and B9 Part Switch.

Thank you. Kindly read contributiing.md, code_of_conduct.md and styleguide.md.\n These are boilerplate.

@zer0Kerbal, could you ask some of the folks in the Realism Overhaul/Real Fuel subcommunity and see if they're willing to do a Real Fuels patch?

https://github.com/zer0Kerbal/WernhersOldStuff/blob/master/GameData/WernhersOldStuff/configs/RealismOverhaulWernhers.cfg

Might also be useful.