Add modifiers to grabbed and restrained

[cdverrett94]

Closes #207

Applying the modifiers for grabbed and restrained. Added characteristic to the options on the rollCharacteristic method.

I added an isNotStatusSource to the AE class. I couldn't just use !isStatusSource because it would trigger even if the actor didn't have the status effect. I thought about adding an optional fourth parameter to reverse the status source check, but that seemed like the return would be confusing if isStatusSource returned true when they weren't the source. If you have a better idea on handling that, let me know.

[JPMeehan]

usually the answer for a three-part state is false, null, and true - it's one of the reasons that _preCreate relies on an explicit return of false. Would that help?

[cdverrett94]

usually the answer for a three-part state is false, null, and true - it's one of the reasons that _preCreate relies on an explicit return of false. Would that help?

Yeah, that helps. Thanks for the advice!