v70: Happy Holidays!

What's Changed

• Ignore built files by @QuentiumYT in #211

• Allow attached icons in any mode as an option, not just on app switcher.

• Broke up app switcher tint color into a color and a blend setting
  instead of a color with alpha.

• Saved background color in a setting so it can be used in prefs.js to set
  the tint color.

• Just one size for attached and overlay icons instead of sizes for each.

• Maybe better placement of coverflow side previews when
  preview_to_monitor_ratio gets small. Scale the distance from the
  middle preview based on it.

• Listen for gnome-shell theme changes and update the background
  color setting to match the new theme.

• Reorganized preferences. Fixed some subtle bugs.

• Some code cleanup.

• Added github and paypal to preferences donation page.

• Added some logic to get attached icons to fade in / out correctly in timeline switcher.

• Minor fix for overlay icon going behind previews in timeline switcher.

New Contributors

• @QuentiumYT made their first contribution in #211

Full Changelog: v69...v70