Goalpost 3: Make Browser Compatible

[coolaj86]

• [x] Convert to BigInt
• [x] Convert to Uint8Array
• [x] DataView ??
• [x] Convert to Noble Secp256k1 + TweakUtil (in tests)
• [x] #4
• [x] #5

[coolaj86]

Will need a Private Key Tweak / Add function: https://github.com/paulmillr/noble-secp256k1/issues/73

[coolaj86]

This has been done in what is now https://github.com/dashhive/DashHD.js.

[riongull]

@coolaj86,there are unchecked boxes above. Are they done as well? Let's check them off if so.

[coolaj86]

@riongull the responsibility of what goes where shifted, but it's all handled appropriately regardless.

I checked the boxes, but they don't mean the same thing anymore.