Removed old files

Fixed a bug when an inputs would be removed from available ones even if the transaction is refused
Added icons
Display community nodes again
Save community nodes and load them when acccessing a community object

Wallet content now show available sources, while Transactions sent and received will display latest transactions sent and received

Pushing only changed WHT

We can export and import accounts

Configuring account reworking
Some bugs fixed

Account now has Wallets and Communities
Wallets are now managing the network side of ucoin
A community doesnt depend anymore on a wallet
A wallet knows what community it is part of thanks to currency name

Adding unit tests for community

Refactoring
Debugging