Add vertical milling machines

[mwhit030]

Summary

Content "Add vertical milling machines"

Purpose of change

Adds manual milling machines, rectangular bar stock, a machinist background, and a practice recipe to the game.

Describe the solution

Create an appliance and add related items and recipes.

Describe alternatives you've considered

seperating the machining proficiency into ones for the lathe/mill, or keeping the machining proficiency and adding those two.

Testing

Additional context

[TheShadowFerret]

Machinist hobby or profession when 👀