Split OMERO importer, editor and insight scripts

Bundle each set of scripts together with the corresponding zip file instead of
putting all of them under OMERO.insight.

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Add standalone OMERO.importer and OMERO.editor for Linux

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Add OMERO.editor and OMERO.importer zips to the linux clients zip

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Merge pull request #2730 from sbesson/rebased/develop/12340_insight_build

Redistribute launch scripts in Linux and Mac client zips (rebased onto develop)