Support for Restricted Assets

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Android Wallet should support Restricted Assets. These assets may not be transferrable if the appropriate tags are not associated with the target address.

There are two levels:

1. Display Restricted Assets and try to send with the network handling bad sends.
2. Detect the absence of the necessary tags (using tag logic from core) and pre-notify the user of the reason the asset cannot be sent. Do the same with frozen Restricted Assets, and Restricted Assets where trading is suspended.