Settings Screen

[ipr0310]

Develop the settings screen (This will allow the user to customize their experience within the mobile wallet)

Stories:

• [x] https://github.com/signum-network/signum-mobile-wallet/issues/41
• [x] https://github.com/signum-network/signum-mobile-wallet/issues/42
• [x] https://github.com/signum-network/signum-mobile-wallet/issues/43

Related epic:

• [x] https://github.com/signum-network/signum-mobile-wallet/issues/22
• [x] https://github.com/signum-network/signum-mobile-wallet/issues/44