Resolve "Browser keyboard shortcuts do not work on some pages"

The prevent element of the @keydown operations for player shortcuts interrupts the default browser action. To fix this, we can either remove the prevent from the function or replace the @keydown with @keyup or @keypress. This MR uses the former method, which allows both bespoke FW shortcuts to work as well as built-in browser functions such as ctrl+f and ctrl+l.

This fixes interruptions to the following shortcuts:

• ctrl+f for find
• ctrl+l for URL bar focus
• ctrl+s for save page as HTML
• ctrl+q for closing tabs/pages on certain browsers/operating systems

Closes #340 (closed)

Closes #985 (closed)