Switch to MessagePack

[shorowit]

Pull Request Description

Closes #903. Replaces use of EnergyPlus SQL output with MessagePack for performance & file size reasons.

Here are results for various simulations. Runtime refers to the entire end-to-end workflow (creation of IDF, simulation, and output processing). Filesize refers to just the sql/msgpack output files.

	Prev Runtime [s]	New Runtime [s]	Runtime Reduction	Prev Filesize [MB]	New Filesize [MB]	Filesize Reduction
Simulation w/ 60-min timestep, no timeseries output	5.0	5.0	0%	0.5	0.1	80%
Simulation w/ 60-min timestep, 60-min outputs (end uses only)	6.0	5.5	8%	8.2	1.6	80%
Simulation w/ 60-min timestep, 60-min outputs (ALL outputs)	10.7	7.5	30%	28.1	5.0	82%
Simulation w/ 10-min timestep, no timeseries output	15.2	15.1	1%	0.5	0.1	80%
Simulation w/ 10-min timestep, 10-min outputs (end uses only)	21.1	17.9	15%	47.5	8.4	82%
Simulation w/ 10-min timestep, 10-min outputs (ALL outputs)	47.6	29.8	37%	171.7	29.2	83%

This PR also now allows OS-HPXML output files (e.g., results_timeseries.*) to be in MessagePack format (instead of CSV/JSON) if chosen.

Checklist

PR Author: Check these when they're done. Not all may apply. strikethrough and check any that do not apply.

PR Reviewer: Verify each has been completed.

• Schematron validator (EPvalidator.xml) has been updated
• Sample files have been added/updated (via tasks.rb)
• Unit tests have been added/updated (e.g., HPXMLtoOpenStudio/tests)
• Documentation has been updated
• Changelog has been updated
• openstudio tasks.rb update_measures has been run
• Checked the code coverage report on CI
• No unexpected changes to simulation results of sample files

[shorowit]

This provides a nice speed improvement but we're unable to proceed because it's not currently working on Windows.