* add a currency entity

* revert test change, remove unnecessary `as any`

* remove unnecessary truthy assertions

* support currency amounts for input/output of trades

* support currency amounts for input/output of trades

* allow routes to encode if they end in ETH/WETH

* get the trade/route to support ether input/output

* router test

* add some todos

* working best trade exact in

* working best trade exact out

* remove only

* tests for exact in router methods

* complete the router tests

* add value as an output swap parameter