Build epoch in info, flash-status command, cmake version embedding

firmware/test.cpp

@@ -20,6 +20,7 @@ static constexpr handler_entry handlers[] = {
     {RequestFlashErase::ext_id, typed_handler<RequestFlashErase, handle_flash_erase>},
     {RequestFlashWrite::ext_id, typed_handler<RequestFlashWrite, handle_flash_write>},
     {RequestReboot::ext_id, typed_handler<RequestReboot, handle_reboot>},
+    {RequestFlashStatus::ext_id, typed_handler<RequestFlashStatus, handle_flash_status>},
     {RequestListTests::ext_id, typed_handler<RequestListTests, handle_list_tests>},
     {RequestTest::ext_id, typed_handler<RequestTest, handle_test>},
 };