Missing session infos and changed yaml parsing

[armin-rc]

Hi Marvin,

please consider pulling my changes to your repo.

Changes:

• added missing fields in the session info data
• changed yaml parsing (the "old" code is still there but not active)
• added some testing functions
• extended the error log on yaml exceptions

Why did I do that? When turning on yaml exceptions there were quite a few and it turned out that some properties where missing in the session data structure. And, while I am on that, I noticed that in some cases the yaml string sanitation did not work correctly. So I added this quite simple yaml cleanup method which seems to work quite nicely.

If you want me to make some changes, please let me know. If I can, I will ;-)

Greetings and best regards, Armin