Change temperature capacitance multiplier argument from string to double

[joseph-robertson]

Pull Request Description

Related to:

• a user trying to set TCM as a discrete integer with variables in PAT
• Temperature capacitance multiplier #1148

Checklist

Not all may apply:

• Schematron validator (EPvalidator.xml) has been updated
• Sample files have been added/updated (openstudio tasks.rb update_hpxmls)
• Tests have been added/updated (e.g., HPXMLtoOpenStudio/tests/test*.rb and/or workflow/tests/test*.rb)
• Documentation has been updated
• Changelog has been updated
• openstudio tasks.rb update_measures has been run
• No unexpected changes to simulation results of sample files

[shorowit]

Thanks!