Add shooting skill comparison to sway stat page

[Keshash]

Additions

Describe new functionality added by your code, e.g.

• Adds a line to sway stat in weapons info page to help compare how much sway a weapon has. Inverts the usual sway calculation to figure out how much weapon handling a pawn needs to reduce it to an acceptable level.

Reasoning

Why did you choose to implement things this way, e.g.

• Helps compare the differences in pawn skill required between guns. I.e., for our shotguns, it suggests that differences in skill needed is:

Mossberg - 7 skill
Saiga - 6
Usas - 10
KS23 - 9

AKM - 5 skill
M16 - 7 skill
FN FAL - 10 skill

• For most users its difficult to understand what sway does, this gives examples in understandable terms.
• 3 degrees of deviation was arbitarily picked as a value that is achievable for most weapons and lands them in 0-20 skill range.

Testing

Check tests you have performed:

• Compiles without warnings
• Game runs without errors
• (For compatibility patches) ...with and without patched mod loaded
• Playtested a colony (specify how long)

[github-actions]

You can download the rebuilt assembly for this PR here: https://combatextended.lp-programming.com/CombatExtended-22042959774.zip

[github-actions]

You can download the rebuilt assembly for this PR here: https://combatextended.lp-programming.com/CombatExtended-22123671621.zip

[N7Huntsman]

Works, though I think I'd like to see it stashed behind the Show Extra Stats mod option.

[Keshash]

If Perkins has a hit chance calculation algorithm, perhaps this PR would be redundant then