Add singleton access for the jarred resource manager.
Add singleton access for the jarred resource manager.

openxal/openxal,openxal/openxal,luxiaohan/openxal-csns-luxh,openxal/openxal,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,openxal/openxal,luxiaohan/openxal-csns-luxh,EuropeanSpallationSource/openxal,openxal/openxal,luxiaohan/openxal-csns-luxh,luxiaohan/openxal-csns-luxh,EuropeanSpallationSource/openxal