Merge tag '1.8.4' into develop

Stored function support, remote web service caching, various bug fixes.
fix access check on stored procs and funcs
swagger clear cache call not clearing event list or service files
rebuild swagger immediately after clearing to ensure events run on next call
support for IBM DB2
New HostedStorage and associated interface
Merge branch 'develop' of github.com:dreamfactorysoftware/lib-php-common-platform into develop
Current work checkpoint. See diff for details.
Composer dependencies updated.
Composer dependencies updated.
Composer dependencies updated.
Composer dependencies updated.
fix for email SMTP setting not working, string and enum config clash, revisit
Merge branch 'develop' of github.com:dreamfactorysoftware/lib-php-common-platform into develop
Reverted change of caching config to file from store back to flat file
Update to fabric caching to not use platform/app store
Merge branch 'develop' of github.com:dreamfactorysoftware/lib-php-common-platform into develop
Composer dependencies updated.
Treat "Origin: null" the same as an empty origin
Another CORS change. Treat "file://" like a valid origin if "*" is allowed.