TEMPORARY snapshot coupling

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add the script interpreter plugin

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add a 'test drive' for the script interpreter

This makes it easier to debug and improve.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
TODO:

- use OutputPane in TextEditor
- Javadoc

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>