Validate all the non-webview origin requests

[ferranvila]

Validate all the non-webview requests originated by the application.

For example: the VideoActivity

Clue: URLStreamHandler

[kechis]

validate inline image base64:
else if (Utils.validateRegexp(url, "^data:(.)/(.);base64,(.*)") && method.equals("GET")) {

                // JAVASCRIPT INLINE REQUESTS

                // TODO: forward response
                return null;
            }