Create a new display plugin based on JavaFX (moved from gama-issues)

[AlexisDrogoul]

The current Java2D base for the "simple" (i.e. 2D) displays is becoming more and more obsolete and complicated to maintain at each new JDK version.

A nice (and somehow easy, now that we will probably require at least JDK 1.7 for GAMA) way to keep most of the code while using a newer technology would be to port it to JAVA FX.

Two links:

https://wiki.eclipse.org/GEF/GEF4/FX (integration of FX and SWT components)
https://github.com/jfree/fxgraphics2d (for reusing exactly the same Java2D codebase on a FX Canvas).

Once this transition is done, we will also be able to clean many things (esp. the zoom) and to change some things (because Java FX provides a complete scene graph) and maybe merge the two display technologies ? OpenGL + Java FX (they are interoperable).

(moved from https://github.com/gama-platform/gama/issues/1312)