trezor: adapt to new passphrase mechanism

- choice where to enter passphrase is now made on the host
- use wipeable string in the comm stack
- wipe passphrase memory
- protocol optimizations, prepare for new firmware version
- minor fixes and improvements
- tests fixes, HF12 support

contrib/epee/include/net/http_base.h

@@ -33,6 +33,7 @@
 #include <string>
 #include <utility>
 
+#include "memwipe.h"
 #include "string_tools.h"
 
 #undef MONERO_DEFAULT_LOG_CATEGORY
@@ -200,6 +201,11 @@ namespace net_utils
 				this->~http_response_info();
 				new(this) http_response_info();
 			}
+
+			void wipe()
+			{
+				memwipe(&m_body[0], m_body.size());
+			}
 		};
 	}
 }