ENH: Configure extension build-tree launcher for starting Slicer

Sam Horvathrequested to merge
github/fork/jcfr/configure-convenience-launcher-in-extension-build-tree into master

Created by: jcfr

This convenience launcher allows to start Slicer ensuring the extensions being developed (and its dependencies) are properly loaded.

Co-authored-by: Csaba Pinter csaba.pinter@queensu.ca

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