More expressive Exception
Makes imageprovider discover images in release build
Cleanup
Separates preview threading from behaviour
Adds a demo for the misaligned preview screen
Simplifies demo content
Dumbs down demo to the very bottom
* Something between miglayout and webview is broken.
* BorderPane works like a charm
Fixes broken Scroll-View
* Uses BorderPane instead of MigPane
* Hardly a visible difference
Finalizes demo for bug report to miglayout