Add shortcuts for various actions:

* Ctrl+Shift+C - Copy (same as gnome-terminal)
* Ctrl+Shift+V - Paste (same as gnome-terminal)
* Ctrl+Shift+F - Open/close search bar
* F3 - Find Next
* Shift+F3 - Find Previous
* Ctrl+Shift+X - Clear Everything (History and current display)
* Ctrl+Shift+S - Split / Unsplit the view
* Ctrl+Shift+T - Detach the current view
* Ctrl+Shift+W - Close current tab (same as gnome-terminal)
* Ctrl+Shift+A - Monitor for Activity
* Ctrl+Shift+I - Monitor for Silence