GUI support to filter wallet accounts by coin type

**Feature description**

Categorize wallet accounts by coin type

**Is your feature request related to a problem? Please describe.**
No GUI elements for altcoin specific accounts

**Describe the solution you'd like**
Once different plugins will be added many altcoins get supported and it is necessary to filter them by coin type.

**Additional context**
Needs space for coin icon.

**Possible implementation**

- [ ] Feature mockups
- [ ] Implement filter GUI controls and update wallet list accordingly