Default account option

**Is your feature request related to a problem? Please describe.**
I like to always start with my main account when opening the app.

**Describe the solution you'd like**
An option to select one account as Default. Then the default account will be open when the app opens for the first time (ie: after being closed for a while or manually quit)

**Describe alternatives you've considered**
I manually select my default account before closing the app, but this is tedious and sometimes I forget, making me comment from the wrong account during my next session.

**Additional context**
Avelon app has this option and I find it extremely useful.