Source code shown for the examples should come from the same code that is compiled to run the examples, to avoid discrepancy.

Deleted *.txt files containg the diplayed code and loading actual Ensamble code instead. This code still needs to be filtered to
change it into executable examples later. That is each sample shown to the user should extend JFXApp, so user can just copy and run it.
Add syntax highlighting to the displayed source code.