[CLI Generator] Create Sections & Entrytypes via the CLI

[joshuapease]

Calling a command like this...

craft viget-base/generate section resources --types="caseStudy, webinar, glossary"

Will create a new section in the Craft admin with corresponding entry types.

The appropriate templates will also be created in templates/_elements/

If there are multiple entry types, the pattern will be templates/_elements/sectionName/index.html with corresponding files for each entry type.