Some updates to the HomeBuilder (#417)

* Added semantic labels to tags Floors, Rooms and objects
* Added a Cellar as a Floor
* Added support for more languages which where already available as translation
* Integrated the webpack build inside Maven
* Only allow minor updates in the package.json to make sure new version will not easily break the build, if semver fails again
* Remove dist folder because it should be generated through the build
* Switched from 'hidden-xs-up' to 'd-none' as proposed in bootstrap migration guide
* Switched from 'scope' to 'slot-scope' as suggested by vue 2.5 migration
* Added some additional parents in the vue schema because they were needed
* Removed osgi import from manifest
* Switched to a computed setup and the build in fieldMultiselect
* Switched to a 'computed' setup
* Remove the package fieldMultiselect and switch to the build-in
* Applied changes from review.
* Formatted JS files
* Re-introduced (customized) fieldMultiselect and minor fixes
* Re-introduce custom multiselect because this is the one that offers the icons
* Add the floor name to the label of room-based object selector
* Make sure that generating tags can be switched off
* Switched from floor-count to choosing custom floors
* Add no-save and corrected some js warnings

Signed-off-by: Martin van Wingerden <martin@martinvw.nl>

.gitignore

@@ -4,5 +4,8 @@
 /*features*/*/src/main/history/
 maven-metadata-local.xml
 dependency-reduced-pom.xml
-**/node_modules/
 npm-debug.log
+
+bundles/org.openhab.ui.homebuilder/web/dist
+bundles/org.openhab.ui.homebuilder/npm_cache
+bundles/org.openhab.ui.homebuilder/web/node