Added Tracker object to manage syncing of blocks

- Switch from template driven forms to reactive forms
- Add pipes for coin notation and coin abbreviation (tbc)
- Improve navigation, add lazy loading and back buttons
- Add classes for creation, recovery and loading of wallets
- Various small improvements

Creates accounts and create addresses

Added a WalletHierarchy class to contain accounts, addresses and transactions.

Add Wallet Manager

Everyone get on the Visual Studio 2017 party train!

Updated Stratis.Bitcoin to version 1.0.1.5-alpha and removed NBitcoin, which is now replaced by NStratis

Created a WalletManager to manage the user's wallets.

Replace Create/Recover and Load methods to use it.

Small API changes 

No such thing as a wrong password to recover a wallet. the recovered wallet will simply be a different one

Added utility endpoint for UI to list wallets files