Added GENERATOR, Added MANUAL_MILL

[J3fftw1]

Short Description

Added multiple items to create just 1 generator Most items are needed in future recipes aswell

Additions/Changes/Removals

Added Generator Added Manual Mill Added Tin plate Added Tin Item Casing Added Uninsulated Tin Cable Added Tin Cable Added Copper Plate Added Copper Item Casing Added RE Battery

Related Issues

N/A

Checklist

• [x] I have fully tested the proposed changes and promise that they will not break everything into chaos.
• [x] I have also tested the proposed changes in combination with base Slimefun and made sure nothing breaks/unexpected happens.
• [x] I followed the existing code standards and didn't mess up the formatting.
• [ ] I did my best to add documentation to any public classes or methods I added which may not be obvious to maintainers.
• [ ] I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values

[J3fftw1]

wait for #80 to be merged