Recognize when last attack is critical and set damage & default button accordingly

[roth-michael]

Partially addresses #4968
When rolling damage from an attack activity's chat card, check lastAttack for whether it was a crit. If so, pass isCritical in the config argument and options: { defaultButton: "critical" } in the dialog argument. This way, shift-clicking damage after a crit will roll critical damage, and going through the dialog will show the crit dice & highlight the crit button (similar to the default behavior of advantage/disadvantage for the rolls that currently have that functionality).