Support for multiple gear slots

[rmkane]

Hey, I have forked your code and have added some slight improvements and additions to it. If you are interested, take a look.

https://github.com/rmkane/gbgwcalculator.github.io

Maybe we can collaborate on this and come up with a great way to add the additional gears. I am gonna take a stab at this over the next day or two.

I may place the "Gears" panel between the "Parts" and "Part List" columns.

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Anyways, here is the working IO page:

https://rmkane.github.io/pages/gbgwcalculator/

[rmkane]

I updated my fork to include the Right Arm gear, take a look at the link above.

Here is my commit: rmkane@4dd2b9f

[rmkane]

Hey, I just added a dark theme that was recommended by someone. I also added some image and font assets to give it a polished-look. If your're interested, you can take a look!