v2.0.2: Various fixes and small usability improvements

Mostly fixes in this release, addressing the following:

General

• Make wallpaper source browse and help dialogs resizable to accommodate different resolutions
• Left double click on tray icon now opens wallpaper configuration
  • Seems to be just a single click on Manjaro KDE

Linux

• Adjust KDE detection to remove false positives

Windows

• Fix issue where the wallpaper would become a solid color or black
• Fix settings panel not opening