Clean wallet option

[kangaderoo]

When tranferring the complete content some dust might stay behind.
If the fee for the transaction is known, a chekcbox to 'take fee from transfer amount' would make
it possible to clean the wallet, and not leave dust in the wallet.
Maybe togeter with max-button that uses the wallet-ballans to the last danoshi for the ammount.

[ZeroPointThree17]

We will work on this later down the line after implementing some higher-priority features, but duly noted and will leave this issue open for now.