Global Empty Capsules Market Assessment, By Type [Gelatin Capsules, Non-Gelatin Capsules], By Functionality [Immediate-Release Capsules, Sustained-Release Capsules, Delayed-Release Capsules], By Application [Pharmaceutical Applications, Nutraceutical Applications], By End-user [Pharmaceutical Industries, Nutraceutical Industries, Others], By Region, Opportunities and Forecast, 2017-2031F