Allow changing name and image of an existing account

[dbadol]

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Enhancement description Add an option in the "Account" menu (top right) or in the settings to allow modifying its name and image.

Today, the GUI only allows to do that at new account creation. After that, the change is still possible, but only by editing the settings.ini files:

[account]
label=Wallet DeFi
picture=3

Platform and build Windows, Mac, Linux Beam Wallet 7.5

Screenshots The same GUI used for account creation could be used.