Update resource tools to download PSM 4 solar files

[brtietz]

The GUI defaults to PSM 4 after the 2024.12.12 release. PySAM should update ResourceTools.py's defaults and documentation to match.

[brtietz]

Relevant string is nsrdb-GOES-aggregated-v4-0-0 (see SAM's nsrdb.cpp for additional documentation options)