Rebuild

[prolic]

• [x] Remove dependency on https://github.com/prolic/secp256k1-schnorr
• [x] Add dependency on https://github.com/haskoin/secp256k1-haskell (secp256k1 haskell bindings)
• [x] Add dependency on https://github.com/haskell-bitcoin/libsecp256k1-haskell (same, but supports schnorr)
• [x] Add dependency on haskoin-core (adds Mnemonic)
• [x] Add dependency on bech32 (may not be needed because of haskoin-core)
• [x] Implement NIP-06
• [x] Remove monomer
• [x] Switch license to GPL v3
• [x] Add QT (qtah-qt5)
• [ ] Rebuild User Interface