Add backup command (#53)

* Backup list command
* Backup apply command
* Backup create command
* Backup delete command
* Other minor changes

Author: anf

.gitignore

@@ -3,6 +3,9 @@
 # VS Code workspace file.
 *.code-workspace
 
+# Launch settings
+launchSettings.*
+
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
 ##