Sell Half On Double

Notes:
- In settings leave 0 for actual price, or set a new price and the SHOD levels will change too.

เอกสารเผยแพร่:

Re-structured the code and provided more input options to user.

เอกสารเผยแพร่:

Added fees calculation to have them covered in selling price.

เอกสารเผยแพร่:

Updated the chart and marked fees section in code

เอกสารเผยแพร่:

I've updated the fee formula to be more accurate.