Create mob_droplist_toau_era module to remove out of era items.

[ZenDiime]

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• 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?

Created a module that gives the ability to remove or add all out of era items for varying time frames. Information was pulled from patch notes, wiki sites.

This is designed for a level 75 cap server.

Steps to test these changes

• add mob_droplist_ooe to init.txt

• See that the mobs do not drop specified items

[WinterSolstice8]

this should probably be renamed to a ToAU file instead of generic "ooe". Maybe in it's own toau subdir too?

[ZenDiime]

Something simple? Like mob_droplist_toau?