Stupendous Smeltery Accelerator

Adds four tiers of Smeltery Accelerators, which can be played on top of a Smeltery Controller to speed up the smeltery by 25% up to 200%!

Inspired by SOLs_Gaming's Simple Smeltery Accelerator, but no code or assets ahve been taken/borrowed. 

Questions? Comments? Concerns? Errors/bugs?

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