Multiple Fixes

[Lisias]

• Restoring Equip/Remove helmet to EVA capable Tourists
• Preventing regular Crew to be "promoted" to Tourists at all
• Surviving KSP's UpdatePipeline
  • Restoring Tourists Configuration between loading savegames
• Applying Tourists rules to Tourists sitting on External Command Seats

[Lisias]

I had to convert it to a draft. Something regressed on my rig, probably a NRE that I prevented on the OnLoad handler but by then, that code stopped being ran at all and the reinit thingy regressed.

[Lisias]

False alarme! I had forgotten a rogue DLL on the installment! :)

On the bright side, I remembered that once Tourists can be toured on External Command Seats, it would be nice to allow them to take selfies from it.

And, of course, selfies still works - and without helmets!

So I'm promoting this PR to be applied again.