Enable looking glass and specify path to plugin
Enable looking glass and specify path to plugin

Tomviz will use the path specified in order to find the plugin
at runtime.

Signed-off-by: Patrick Avery <743342299f279e7a8c3ff5eb40671fce3e95f13a@kitware.com>

OpenChemistry/tomviz-superbuild,OpenChemistry/tomviz-superbuild,cjh1/tomviz-superbuild,cjh1/tomviz-superbuild