v11

• Added URL detection similar to GNOME Terminal: #6
• Fixed multiple warnings related to object destruction: #25 970cd20
• Now the app will show an error message using Zenity, if some dependency is not installed
• GDK_BACKEND environment variable is now correctly passed to subprocesses in all cases (i. e. it's never affected by ddterm's backend setting)
• Keybindings and popup menu entries to open new tab in various positions (before/after current/all)