Combat fixes

[luciensadi]

A massive rewrite of fight.cpp's hit() function. Major changes:

• Nerve strike no longer ignores as many penalties, and has had its 4x Qui damage reduced to the canon amount.
• When fighting with cyberweapons, your best active weapon will be used instead of your first one. In addition, two cyberweapons now means you gain the half-strength power bonus from canon.
• When fighting with cyberweapons, you'll actually use your cyber_implants skill.
• You now won't surprise an NPC who's already attacking you.
• Implemented gyro mounts-- they now provide recoil/movement modifier reduction.
• Fixed several issues with firing from vehicles being way easier than it should have been.
• Added messaging to stop_fighting() and recoil damage calls so you actually know what's going on.
• Rolls messaging has been expanded to convey more information.
• Fixed strange smartlink case where you could get a -4 TN.
• Innumerable spellchecks and typo fixes.