Increase resting rate dramatically

When people complain about lag its often in the context of resting before autoexplore.  Normally this is pretty fast, but sometimes an edge case where you have barely any regen of one form or another can make it take hundreds of turns.

This has no real gameplay consequence but does exacerbate lag issues from unrelated problems.

This changes the resting bonus to not kick in at all for 15 turns (avoiding interactions with life regen buffs and such) but scale much faster and higher after that.