per @spock64 suggestion add more check when upload

Add Wsocket message when upload is cancelled and so no info is sent to give root cause, need latest WebUI for catching these message
On embedded unlike in 3.0 websocket is not setup so only use the xnlhttp.onerror
change embeded version to 1.3.1
change version to 34
update npm when building embedded page to be sure environment is properly set

Author: luc-github

embedded/build.bat

@@ -1,4 +1,5 @@
 cd %~dp0
+cmd.exe /c npm install
 cmd.exe /c gulp package
 cmd.exe /c bin2c -o nofile.h -m tool.html.gz
 cat header.txt > out.h