Add new shortcut navigation in the browser panel

[dannycolin]

• Add Slash shortcut to focus the filter input
• Use event.code instead of event.keyCode
• Add modifier key detection

[dannycolin]

Works as expected except for the modifier keys logic.

WFM. Could you pull the newest commit and retry?

How can I test this part?

For the modifier detection:

1. Open MAC popup
2. Press [mod] + [0-9] where `[mod] can be altKey, ctrlKey, shiftKey, metaKey or a combinaison of it.

Expected: Nothing. It should prevent a container to be opened. Only pressing [0-9] should still work.

For the search input focus detection:

1. Open MAC popup
2. Press [0-9]

Expected: It should prevent a container to be opened and the [0-9] character should be inserted in the search input.