Split the importer module out from the installer module (#468)

* Split the importer module out from the installer module

* Cleanup of unused imports

* Move updater into separate module #453

* Remove unused imports/formatting

* Disable the install and importer modules at the end of the setup

* Unused imports; update IJ style

* test explicit stage for php+mysql

* add more to matrix

* Add different MariaDB versions

* undo

config/modules_statuses.json

@@ -1,7 +1,9 @@
 {
     "Awards": true,
+    "Importer": true,
     "Installer": true,
     "Sample": true,
+    "Updater": true,
     "VMSAcars": true,
     "Vacentral": true
-}
+}