-Added OpenSSL and HTTPS support

-Built-in version of the library for Windows, Android and iOS (other OSs use system one)
-Small fixes all around

core/io/stream_peer_ssl.h

@@ -0,0 +1,34 @@
+#ifndef STREAM_PEER_SSL_H
+#define STREAM_PEER_SSL_H
+
+#include "io/stream_peer.h"
+
+class StreamPeerSSL : public StreamPeer {
+	OBJ_TYPE(StreamPeerSSL,StreamPeer);
+protected:
+	static StreamPeerSSL* (*_create)();
+	static void _bind_methods();
+public:
+
+	enum Status {
+		STATUS_DISCONNECTED,
+		STATUS_CONNECTED,
+		STATUS_ERROR_NO_CERTIFICATE,
+		STATUS_ERROR_HOSTNAME_MISMATCH
+	};
+
+	virtual Error accept(Ref<StreamPeer> p_base)=0;
+	virtual Error connect(Ref<StreamPeer> p_base,bool p_validate_certs=false,const String& p_for_hostname=String())=0;
+	virtual Status get_status() const=0;
+
+	virtual void disconnect()=0;
+
+	static StreamPeerSSL* create();
+
+
+	StreamPeerSSL();
+};
+
+VARIANT_ENUM_CAST( StreamPeerSSL::Status );
+
+#endif // STREAM_PEER_SSL_H