Medical - Add fracture chance setting

[mharis001]

When merged this pull request will:

• Add fractureChance setting, ACE3 Feature Requests #3594 (comment)
• Cleanup unused strings

[PabstMirror]

What if we made the setting control FRACTURE_DAMAGE_THRESHOLD
or have magnitude of damage somehow influence the random chance

&& {_woundDamage > FRACTURE_DAMAGE_THRESHOLD}
&& {random 1 < (linearConversion [FRACTURE_DAMAGE_THRESHOLD, 2*FRACTURE_DAMAGE_THRESHOLD, _woundDamage, 1, 1.5, true] * EGVAR(medical,fractureChance))}

[mharis001]

Can change to that, would need to update the tooltip to make that clear. Maybe something like: "The probability of a fracture causing wound resulting in a fracture. This value is increased by the amount of damage, maxing out at a 50% increase to this probability at double the minimum fracture damage threshold."