[Echo.Control] Introduce new config parameter called "useSecureAPI" to targeting request different scheme instead of hosting page + appropriate fixes in the controls & plugins;
[Echo.API.Request.*] introduce parameter called "secure" with the same reason above
[Echo.Control] Fix docs for the "useSecureAPI" parameter
Merge branch 'neurostep/f1159-triggering_https_requests_from_http_pages'