Fix bug contact radio button on transfer money dialog

Creating contacts from community members list by double clicking + adding pubkey verification in account creation

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

Refactoring
Debugging

Configuring account : changing its name and the communities