Merge branch 'feature/esptool_secure_boot' into 'master'

Secure boot support

Also includes a lot of esptool.py changes (two new command line tools, espefuse.py and espsecure.py)
https://github.com/themadinventor/esptool/compare/feature/esp32_v20_refactor...feature/esp32_secure_boot?expand=1


See merge request !163

components/log/include/esp_log.h

@@ -19,6 +19,10 @@
 #include <stdarg.h>
 #include "sdkconfig.h"
 
+#ifdef BOOTLOADER_BUILD
+#include <rom/ets_sys.h>
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif