Delphi-PRAXiS - xxm v1.2.5.450

For a while I thought there's not enough there to have a full release, but with the switch from XML to JSON, and NTLM and WebSocket support in xxmHttp and xxmHSys2, plus all the minor changes and tweaks that improve performance and security, it turns out to be quite a formidable release. Regretfully, by finally deciding to have all string arguments const anyway, any project's xxmp.pas will have to change. A long time I was hesitant about this because I feared binary incompatibilities, b