Initial implementation of the Mob Info window

Added a Mob Info window, accessed with /lcc mobinfo, which shows mobs which you have hit with an autoattack which this could guess a toughness value from, and any abilities you've hit them with.

Guessing toughness from an autoattack requires that either you only have a melee or ranged weapon equipped, or one or the other would result in a negative toughness for the given damage.

Note that when running this addon, the mob log data will grow without bound, presumably crashing your client eventually. Use the Delete button in the Mob Info window to remove a mob from the record. I also recommend you only load this module if and when you want to examine your combat numbers.

Allows overriding the calculated toughness value for a mob, and the casting time (ie time over which DPS is calculated) for the ability.

You currently have to select which stat and weapon DPS values apply, since there's no way in-game to tell that and I haven't put in the infrastructure for databasing that yet.

Also cleaned up the debug output a lot, now you get a single line of debug output per hit, showing the results of the combat log parse.

The data collection for the Mob Info window ignores critical hits but not debuffed hits. So make sure you don't apply any relevant debuffs (ie. toughness or damage, Armour/Resist is OK) to enemies.

Buffs for your stats should be fine, we use the same values as the Player information window. However, bonus damage from things like Warcry are probably going to affect the numbers.

Also, it doesn't (cannot!) distinguish between on-hand and off-hand damage, so best to not use this with an off-hand weapon, although it appears that every off-hand attack is preceded by an on-hand attack so all it'll do is complain that the toughness of the mob appears to have changed.