Re-enable frame decorations since without them there is currently no way to move, resize or close the running application easily.
Fix layout to ensure that all components are visible and example icon tiles are rendered without horizontal scroll bar.

Some controls wehe stretching outside of visible area, for instance in the tree view.
Example tiles required horizontal scroll bar since VBox in which they were hosted was set to have too much width.
Layout was modified to properly fill the main stage window as is it is resized.
Generally removed any references to primary screen width, using dynamic sizing instead.
Upgrade ScalaFX dependency to latest milestone release.
Upgrade plugins and dependencies to latest releases.