Add some quality-of-life changes regarding text/selection shortcuts

[endorpersand]

Feature from downstream

Text Updates

• Typical text-editing shortcuts (Ctrl + A, Ctrl + C, Ctrl + V, Ctrl + X, Ctrl + Z) can now be used in text inputs without activating the canvas shortcuts (e.g., selecting all components).
• Backspace should now work properly on the text component

Selection Updates

• Ctrl-clicking a component now toggle-selects components
• (macOS) Command-clicking should allow you to select components (which would be done by ctrl-clicking on Windows).
  • Previously, this behavior was also mapped to ctrl-clicking in macOS, but ctrl-clicking also opens a context menu, so this is probably unintended