Allow Actor Roll Data in Resource Cost Fields

[Khunkurisu]

Is your feature request related to a problem? Please describe.
There are several abilities which cost a number of focus equal to a skill's rank.

Describe the solution you'd like
Simply enable entering roll data into the cost field so that this can be automated.

Describe alternatives you've considered
Currently we just set it to cost 1 and allow them to manually adjust the remainder. This works fine.

Version
0.3.0

Additional context
N/A

Checklist:

• I have searched the existing issues to ensure this feature has not already been requested.

[zithith]

As this can be manually tracked and there's even a helper button in the chat messages for this, I'm setting it for post 1.0