Add dexterity nerfs as explanations for melee misses

The list of melee miss explanations is stored with the player now, and
added to when the effects on a player are applied each turn.
Make some melee miss explanations more interesting
Improve more melee miss explanation messages.
More spacing fixes.
Propperly remove empty lines when options are hidden.
Merge branch 'melee-miss-explanations-dex' of https://github.com/Spferical/Cataclysm-DDA into dexmsg

Conflicts:
	src/disease.cpp
	src/melee.cpp

Hoping I got it right in melee.
Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA