Aesthetic Margin Long/Short Changes v2 [MrBit]

This is a rewrite of the original:

I really like the above script (Thank you Pastafarian!) but it was annoying that
it always took so long to load, so I made some edits so it would run faster.

Basically I replaced all the custom code (the sum loop and the calculations)
with pinescript builtins since they are faster and I commented out price since it
runs slowly (and I always have it on the chart anyway), but feel free to uncomment if you want it,
it is still a speed up.