BruteFir integration

[bluefuzz]

I have increased the range of freq from 20-14000 to 10-18000 and from bw to 0.06-16 of the EqFa12p filter. 
Validation is shown in the attached image.

@bluefuzz is the Q of 8 enough ?

Yes I think a max Q of 8 is OK. Although REW's auto EQ settings often default to a Q of 10. Most of the headphone settings I've looked at from Oratory, Crinacle etc. (via AutoEQ) rarely get above 6 or 7.