Era accurate guild shops

[montijin]

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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?

Adds era accurate guild shops by adding, removing, changing restock rates and price curves to various items to match documented era numbers.

Steps to test these changes

Check the prices and items available at guild vendors.

[github-actions]

✨ Hello and thanks for the PR! ✨

🤖: This is a friendly automated reminder that the maintainers won't look at your PR until you've properly completed all of the checkboxes in the pre-filled template.

[Skold177]

Easier on the eyes to clean these up.
Also you can probably remove the item comments on the end as well since all the items are keyed by the ENUM entry

patchStock('Ndego', xi.item.CHUNK_OF_COPPER_ORE, { initial = 120 }) 
patchStock('Ndego', xi.item.CHUNK_OF_TIN_ORE,    { initial = 120 }) 
patchStock('Ndego', xi.item.CHUNK_OF_IRON_ORE,   { initial = 120 }) 
patchStock('Ndego', xi.item.BRONZE_INGOT,        { initial =  12 }) 
patchStock('Ndego', xi.item.IRON_INGOT,          { initial =  12 }) 
patchStock('Ndego', xi.item.BRONZE_SHEET,        { initial =  12 }) 
patchStock('Ndego', xi.item.IRON_SHEET,          { initial =  12 }) 
patchStock('Ndego', xi.item.MANDREL,             { initial = 120 }) 
patchStock('Ndego', xi.item.WORKSHOP_ANVIL,      { initial = 120 }) 

[Skold177]

We should also move these into phoenix/lua, with the guild point modules.

[Skold177]

Other than that just a fantastic job.