Can't shift-cast the "sell crewmember" skill

[Cokemonkey11]

I'm concerned that players will misclick which units they want to sell.

I've made the cooldown lower for now, but I'm going to say this is blocked on #45 for now.

[Cokemonkey11]

Reduce cooldown on the Unemploy skill. Partially addresses #51.

→ <<cset 09543b62c877>>

[Cokemonkey11]

@Frotty fyi

[Cokemonkey11]

refactor crewmember generate; add icon for info; disable structure target on tuskarr and demoness. Closes #47, #38, #39, #71, #53, #51

→ <<cset 224cd9f47870>>