Launcher: in debug mode, set the property 'ij.debug' to 'true'
Launcher: in debug mode, set the property 'ij.debug' to 'true'

When the launcher is renamed to 'debug' for verbose output, set a
tell-tale property so Java code can react to that.

Suggested by Curtis Rueden.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

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