[#83818422] Separate radiance/energyplus packaging

-Splits PACKAGE_ENERGYPLUS_AND_RADIANCE into PACKAGE_ENERGYPLUS and
PACKAGE_RADIANCE.
-Passes new options down to OSCore
-Cleans up some path walking code to deal with recent-ish changes to
installation folder layout
OK.  Then I'm going to proceed the way I want to and suffer the unknown consequences.