Improve wounds/strain support for third party modules

[arknano]

Is your feature request related to a problem? Please describe.
Since SWFFG tracks damage "positively" (you receive wounds as damage points, rather than subtracting from a total), it can be a little wonky when working with certain third party modules like bar brawl, which typically expect and accept 0 or negative numbers as "dead" or "over dead".

Describe the solution you'd like
Add a separate stat for wounds or strain over the threshold of the character.
e.g.
stats.woundsOverThreshold
stats.strainOverThreshold

The value should be equal to currentWounds - maxWounds, thus if your wound threshold is 12, and you have 13 wounds, then stats.woundsOverThreshold == 1

Describe alternatives you've considered

• crying about it
• it might also work to have a flipped value? where 0 is at threshold and negatives are over threshold. maybe do both!

[wrycu]

Done, will be released in 1.906. Thanks for the suggestion!