Launcher: find ImageJ 1.x' shipped JRE
Launcher: find ImageJ 1.x' shipped JRE

ImageJ 1.x comes in a variant where the JRE is shipped, living in
<ij.dir>/jre/. Of course, this prevents multi-platform installations
or portable applications, but let's support it nevertheless.

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

biovoxxel/imagej,TehSAUCE/imagej,biovoxxel/imagej,TehSAUCE/imagej,biovoxxel/imagej,TehSAUCE/imagej