Call generate.groovy for src/test/templates/ too

This will allow us to test it, so that we can verify that everything
worked well.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Test the template processor

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Template engine: support multi-line values

This is Markdown style:

	key = ```
	This is
	a multi-line
	value.
	```

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Test the multi-line values in code templates

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

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
End all .java files with a new-line

This is automatically added by 'mvn license:update-file-header'.

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