Add burn fee
1- Add _burnFee and _previousBurnFee 2- Add setter to reset burn _burnFee 3- Add function to calc burn fee calculateBurnFee() 4- Update removeAllFee to add _burnFee 5- Update restoreAllFee to add _burnFee 6- Update _getTValues to include calculateDevFee 7- Update _getValues to include tDev