benchmark: clean up common.js
This commit cleans up benchmark/common.js
with a few generic changes
such as the following:
- declare all
require()
'd libraries at the top instead of in the middle - add some empty whitespace where it helps readability
- changes ambiguous variable names
- standardizes most if / else blocks
- missing semicolons
This is sort of the prep for an up and coming PR I'm writing, but I just couldn't work with the code as it was.