Better use of screen width for query tabs

Hi,

Currently, the left browser tree panel is not collapsible, and the
Properties/SQL/Statistics/Dependencies/Dependents tabs are not even
closable, so together they take up nearly half my screen width.
Because of this, I can only open up to 4-5 additional tabs before my
tabs overflow, which is quite annoying.

I have some suggestions:

- Make the left browser tree collapsible
- Make the Properties/SQL/Statistics/Dependencies/Dependents tabs
closable. Add an option to reopen them e.g. in a menu somewhere.
- Alternatively, move those tabs to the menu bar row. There is just
so much space there right now.(right side of the Help menu).
- Add an option so that when there are many tabs, instead of showing
arrows to scroll back and forth, just keep shrinking the tab width
like in a browser and keep the tab bar's width fixed/not scrollable.

Thanks,

Trung