WebAPI Version 2.3.0

• Vulnerability fixes (#244) - Thanks @pavgra
• Results schema DDL script generator (#289) - Thanks @pavgra, @mpozhidaeva
• Cohort Reporting & Optimization (#286) - Thanks @AnthonyMolinaro, @fdefalco, @anthonysena, @chen-regen, @mpozhidaeva
• Cohort result removal (#310) - Thanks @chrisknoll
• Security & Permission Improvements (#316) - Thanks @pavgra, @mpozhidaeva
• Capture created/modified for all entities (#320) - Thanks @wivern
• Added support for Impala and Netezza via SqlRender 1.4.8 - Thanks @pavgra, @wivern, @schuemie
• Lots of bug fixes per https://github.com/OHDSI/WebAPI/issues?page=1&q=is%3Aclosed+milestone%3AV2.3.0. Thanks @chen-regen, @fdefalco, @chrisknoll, @anthonysena, @leenadR