#288 Improve show/hide of metadata

renamed directives to be more clear
- scMetaDataButton renders the button for showing and hiding of the metadata panel
- scMetaDataPanel renders the metadata panel which can be shown or hidden
- metaDataTree renders the complex tree structure of a details object
#288 Improve show/hide of metadata

streamlined DOM
#288 Improve show/hide of metadata

added first e2e test for show and hide metadata
#288 Improve show/hide of metadata

webstorm refactoring made a relative URL to the file system
#244 added validation if a color was selected
#244 added labels box to use case overview
#288 Improve show/hide of metadata

maximize browser window
Merge remote-tracking branch 'origin/develop' into develop
#241 added bootstrap javascript and jquery
added modal dialog for step links (not finished yet)
Merge branch 'develop' of https://github.com/scenarioo/scenarioo into develop
#244 fixed unit test
Merge branch 'develop' into 64-browsing-app-specific-objects