T2730
Depends on D12377
Since calcFee no longer uses the BCH object, move it from `useBCH.js` to `cashMethods.js`
`calcFee` and `getCashtabByteCount` are also moved above the first call to `calcFee` in `cashMethods.js`. I don't think I had to do this...no errors...just superstition I guess.