223 transfer to savings (#454)

* Add new chain operations: savings, escrow, ... #223

* Place asset first in transfer form, avoids validation error where default asset has no balance

* Adds transfer to savings ... #223

* Adds Savings Withdraw option to user's wallet.  Better support for Basic and Advanced modes. #223

* Align user wallet drop-downs to the right edge of the screen. #223

* Help text for transfer typs. #223

* Savings Withdraw: Correct balance tip and working transaction #223

* Savings Withdraw: history with option to cancel (close #223)

* Savings Withdraw: include savings in wallet's estimated total (#223)

* Savings Withdraw: include pending saving withdraws in wallet's estimated total (#223)

* Savings Withdraw: refreshing data after transactions (#223)

* Savings Withdraw: update insufficient balance validation (#223)

* Add transaction history descriptions for transfer to saving operations #223