Nod Explorer QoL

[XertroV]

Some QoL nod explorer features would be nice (or exposed so I can write a plugin to do them)

• autoclose tabs on close window
• autoclose tabs on returning to main menu
• close tab with kb sortcut

[codecat]

Tabs shouldn't autoclose at all, it would be inconsistent and potentially confusing.

I've added a new "Tabs" menu to Nod Explorer which should hopefully be useful:

I'll need to think about how a Ctrl+W shortcut should be implemented -- it would be nice to have this built in to all closable ImGui tabs.