[lua] ToAU Marksmanship weaponskill module

[Skold177]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Adds a ToAU era weaponskill module for Marksmanship
Date : 2007-11-19 (One day prior to WoTG release)

Accuracy penalty for Slug Shot sourced from :
https://wiki.ffo.jp/html/2547.html

Steps to test these changes

Enable it in the module init, use marksmanship weaponskills