Replace all instances of OrderedDict with dict

[kandersolar]

• Closes is there still a need for irradiance functions to return OrderDict since Python-3.7 is minimum version? #1684
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Replacing all remaining instances of OrderedDict with regular dict. See #1684.

[kandersolar]

This is the list of functions touched in this PR. I will combine it with similar whatsnew entries in the eventual release finalization PR.