2.2.0

• Fixes for Nim devel (by @planetis-m)
• Add DropDown widget
• Send notifications with sendNotification
• Basic threading support using redrawFromThread
• Timeouts using addGlobalTimeout and idle tasks using addGlobalIdleTask
• Add ContextMenu widget
• Add Picture widget for displaying images
  • Basic support for loading, saving and editing images with GdkPixbuf
• Support negative numbers, modulo and exponentiation in FormulaEntry
• libadwaita support
  • Add adw.EntryRow, adw.ComboRow and adw.ExpanderRow
  • Add adw.WindowSurface (Adw.Window)
  • Add adw.Flap widget
  • Add adw.SplitButton
• Documentation
  • Add an overview of all examples (with images of the example applications)
  • Write many new examples for using dialogs, complex widgets and other features of owlkettle
  • Tooling documentation (by @PhilippMDoerner)
  • Internal documentation (by @PhilippMDoerner)