added file generation for SceneBuilder integration

[ennerf]

see #27

mvn package -pl styles generates an additional AtlantaFX-1.1.0-scenebuilder.zip file that maps the AtlantaFX themes to SceneBuilder buttons. I wasn't sure how to change the docs, so I just packed instructions into the Readme.

What do you think about adding a button in the sampler app that installs Themes into SceneBuilder w/o requiring manual steps? It'd be nice to make the integration as simple as possible.

[mkpaz]

Thanks! And sorry for the late response.

I think it's possible to add integration section above or below the color palette at the Theme page. It may look as follows:

• AtlantaFX-1.1.0-scenebuilder.zip is injected into jlink image at build stage
• User presses install button and selects the path to the Scene Builder binary (maybe with a little help if Scene Builder binary is present in the $PATH)
• Install script unpack and transfers CSS files to the Scene Builder installation dir and changes config file appropriately

We should also provide uninstall option to make the change reversible.

I'm not Scene Builder user so I don't how to handle two situations. Whether Scene Builder supports auto-updates and what happens in that case. How it will work when Scene Builder is not used as standalone app but integrated into IDE.