add ota algorithm for device

1. effective "Differential Upgrade" patch algorithm with high compression rate
2. effective recovery algorithm support recovery firmware in blocks which has low memory consumption and wear-leveling strategies, especially suitable for embeded devices with low RAM.
3. add sample ota bootloader project, see:
board\TencentOS_tiny_EVB_MX_Plus\KEIL\ota\ota_bootloader_recovery
4. add sample application project for download firmware through http, see:
board\TencentOS_tiny_EVB_MX_Plus\KEIL\ota\ota_application_download_through_http
5. add sample application project for download firmware through qcloud explorer console, see:
board\TencentOS_tiny_EVB_MX_Plus\KEIL\ota\ota_application_download_through_qcloud_iot_explorer
6. an OTA markdown document is pending

components/ota/common/lzma/3rdparty/Delta.h

@@ -0,0 +1,19 @@
+/* Delta.h -- Delta converter
+2013-01-18 : Igor Pavlov : Public domain */
+
+#ifndef __DELTA_H
+#define __DELTA_H
+
+#include "7zTypes.h"
+
+EXTERN_C_BEGIN
+
+#define DELTA_STATE_SIZE 256
+
+void Delta_Init(Byte *state);
+void Delta_Encode(Byte *state, unsigned delta, Byte *data, SizeT size);
+void Delta_Decode(Byte *state, unsigned delta, Byte *data, SizeT size);
+
+EXTERN_C_END
+
+#endif