fix for issue #840: Basic Training - Grenade is failing to dismiss team

expose FlightTime to lua, disable in-air flame harming moving hogs ☹ aaaand override that in ClimbHome ☺

don't forbid running regular chat commands during turns of other teams. that was probably only meant for emotes to begin with

delay cake boom until it has walked a little bit. also fix accidental drowning of watergods in last commit

add a half-second flighttime delay to flamethrower flames so they can leave the "barrel" of the flamethrower without burning the hog

Should prevent desync hopefully. Thanks unc0rr

fix copypasta-fail that would cause splashes to use invalid sprite data pointer. should fix issue #838

oh right, forgot sheepluva had fixed ice

give sea world edges some icegun love

Wuzzy's changes to climbhome w/ some tweaks by me