Alpha v4

Changelog

1. Bluzellified the app.
2. Added option to open tx on Bluzelle block explorer.
3. Added support for scanning and showing QR codes for sending and receiving tokens.
4. Removed some UI inconsistencies.
5. Improvements in the decryption process of mnemonic.
6. A lot of minor bug fixes and improvements.

Build information

1. Use app-arm64-v8a-release.apk for 64 bit devices.
2. Use app-armeabi-v7a-release.apk for 32 bit devices.
3. Use app-x86_64-release.apk for emulators.