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

.travis.yml

@@ -44,9 +44,83 @@ script:
 after_failure:
   - cat storage/logs/*.log
 
+# Refer to: https://github.com/doctrine/dbal/blob/master/.travis.yml#L39
 jobs:
-  fast_finish: true
   include:
+    # Different test stages
+#    - stage: Test
+#      name: PHP 7.2 + MySQL 5.7
+#      php: 7.2
+#      env: DB=mysql
+#      services:
+#        - mysql
+#    - stage: Test
+#      name: PHP 7.3 + MySQL 5.7
+#      php: 7.3
+#      env: DB=mysql
+#      services:
+#        - mysql
+#    - stage: Test
+#      name: PHP 7.4 + MySQL 5.7
+#      php: 7.4
+#      env: DB=mysql
+#      services:
+#        - mysql
+#    - stage: Test
+#      name: PHP 7.2 + MariaDB 10.1
+#      php: 7.2
+#      env: DB=mariadb
+#      addons:
+#        mariadb: '10.1'
+#    - stage: Test
+#      name: PHP 7.3 + MariaDB 10.1
+#      php: 7.3
+#      env: DB=mariadb
+#      addons:
+#        mariadb: '10.1'
+#    - stage: Test
+#      name: PHP 7.4 + MariaDB 10.1
+#      php: 7.4
+#      env: DB=mariadb MARIADB_VERSION=10.1
+#      addons:
+#        mariadb: '10.1'
+#    - stage: Test
+#      name: PHP 7.2 + MariaDB 10.2
+#      php: 7.2
+#      env: DB=mariadb
+#      addons:
+#        mariadb: '10.2'
+#    - stage: Test
+#      name: PHP 7.3 + MariaDB 10.3
+#      php: 7.3
+#      env: DB=mariadb
+#      addons:
+#        mariadb: '10.2'
+#    - stage: Test
+#      name: PHP 7.4 + MariaDB 10.2
+#      php: 7.4
+#      env: DB=mariadb
+#      addons:
+#        mariadb: '10.2'
+#    - stage: Test
+#      name: PHP 7.2 + MariaDB 10.3
+#      php: 7.2
+#      env: DB=mariadb
+#      addons:
+#        mariadb: '10.3'
+#    - stage: Test
+#      name: PHP 7.3 + MariaDB 10.3
+#      php: 7.3
+#      env: DB=mariadb
+#      addons:
+#        mariadb: '10.3'
+#    - stage: Test
+#      name: PHP 7.4 + MariaDB 10.3
+#      php: 7.4
+#      env: DB=mariadb
+#      addons:
+#        mariadb: '10.3'
+
     # Just packages up a release
     - stage: package
       script: skip