feature request: deferr crit damage calculation to own macro

[spirritus]

Hi there, how the crit damage is calculated can be subject to many houserules. This could be easily supported if an additional crit field would allow for the specification of a custom macro.

For example we use the rule: double the dice, maximize a quarter of the dice (rounded down, minimum of 1) [per type] e.g. a 9th level rogue attacking with a special weapon (normal 2d4+dex piercing damage) and sneak attack would then crit to: weapon: 2d4 -> 4d4 -> 4+3d4 sneak: 5d6 -> 10d6 -> 6+6+8d6 to a total of: 4+3d4+dex + 12+8d6