Software wallet account transaction and operation methods

[rdig]

Ethers have a number of methods available on the wallet that are used to send and receive transactions and manage various aspects of the wallet.

The problem is, they are hidden under the instantiated's wallet prototype and cumbersome to use.

This issue is here to track which ones we need on our software wallet module, expose them via the SoftwareWallet Class and improve them where needed.

This should be treated on a case by case basis as for some of the methods it might make sense to even re-write them ourselves or set them up directly in the Wallet Object (eg: getBalance could easily be an async getter prop)

[rdig]

This issue is no longer relevant as it was split up into three parts to track it's implementation: #73 #74 #75