[CSV Export] Expose CSV export capability in scenario

Expose custom CSV export capability in scenario,
as supported by nasa/MCT-Plugins#161
[Scenario] Incorporate CSV export in scenario build

Include separate CSV export plug-in, from
nasa/MCT-Plugins#161, in the scenario
build.
[Demo] Add CSV export to build
Merge pull request #164 from VWoeltjen/mctPlugins163

[CSV Export] Follow up on CSV export plugin