Make show visualization button work, rename CubeViz_ConfigurationLink.saveToServerFile

- if indexAction was not loaded, button redirects to it
- rename saveToServerFile to saveToServer
Add case to show visualization button, to update existing visualization
Throw out most of the css style of main.css (clean up unused code)
Integrate nothingFoundBox which appears if no data were received

- add destroyView function to Application.ts
- save generated highcharts chart in this.app._.generatedVisualization
- before render chart, destroy it, if it exists
Implement a elementary visualization selector

Additionally:
- rename css class clickable to cubeviz-clickable
- replace cross icon