• Demo: show GTK Layer Shell version
• Demo: fix initially set auto-exclusive zone and fixed size properties (fixes #64)
• API: expose GTK Layer Shell version
• API: expose the underlying layer shell surface (fixes #41)
• Tests: add mock server
• Tests: add integration tests (fixes #60)
• Diagnostics: remove "transient_for != window transient_for" warning
• Diagnostics: improve warning when GTK version may not work by linking to a compatibility table (fixes #66)
• Compat: bump supported GTK to v3.24.23