Address list improvements

[dr-orlovsky]

• [ ] Unused addreses must be in grey
• [ ] Addresses with no balance but which were previously used should be dark (distinctive from gray)
• [ ] Addresses should use mono-spaced font
• [ ] Addresses should be sortable by numberic index value and not string
• [ ] Addresses must be sorted by index by default
• [ ] Provide copy function for the address