#18 added a AddThemeMenuItemListener to the topic tree in WatergisApp
#18 added CAPABILITIES to the enum ComponentName
#18 added properties for the capabilities to the defaultWatergisProperties.xml
#18 moved AddThemeMenuItemListener to own inner class
#18 WatergisApp initialize vCapabilities like the other Views and use it in AddThemeMenuItemListener
#18 add the capabilities view properly to the root window and give it its correct title
#18 the Capabilities window is alway centered in the middle of the screen, when clicked on the 'Add Topic'- menu item
Merge branch 'feature/18-capabilities-window' into dev