create environment for fast visual feedback

The Vex Box View's purpose is to show a hard coded box structure. The
refresh button recreates the BoxWidget. This in conjunction with the hot
code replacement of the JVM allows to immediately see results of changes
in code, without the need to restart the runtime workbench.

Signed-off-by: Florian Thienel <florian@thienel.org>
4 files changed