Melee range

Rewrites the majority of melee talents to check the talent's range field instead of hardcoding the distance. This involved:

• Actually giving a range to talents that didn't have one.
• Replacing the range check with a call to canProject(tg, x, y)
• Moving many hardcoded tg values into a target field, and using getTalentTarget instead.
• Adding an is_melee and is_special_melee (shields) flag to talents (unnecessary, but potentially useful).

Also made it easier to have talents replace the Attack talent, like double strike.

I've run a character up through level 15, but otherwise haven't done much testing.

We are close to 1.3.0; this changes lots and lots of suff; it needs to be fully and carefully tested for all talenst affected; or it'll have to wait for the release after 1.3