Build order rules (#7842)

* Add new global setting

* Check if there are open children before completing a build

* Adds management command to export settings definition

* Fix settings export

* Extract settings data into documentation

* Add global settings spec

* User settings

* Revert strict mode

* Tweak unit test

* Remove unreachable code

* Always export settings first

* Remove unused macro

* Remove old images

* Re-add missing docs strings

* Tweak docs

* Remove unused import

.gitignore

@@ -111,3 +111,4 @@ InvenTree/web/static
 docs/schema.yml
 docs/docs/api/*.yml
 docs/docs/api/schema/*.yml
+inventree_settings.json