Update to version 0.0.68

v0.0.68 - Added fixes from Frank, mostly in UPnPMicrostack.c
Removed windows thumbnail files
Import of v0.0.68
    v0.0.68 - Added fixes from Frank, mostly in UPnPMicrostack.c (Thank you!).
Merge branch 'opentools.homeip.net'
Merge branch 'master' of https://github.com/danm-de/DeveloperToolsForUPnP into danm-de-master
Added a note about my intentions for this repository
Import of v0.0.69
Merge tag 'UPnP_v0-0-69'
Merge branch 'master' into UPnP_Spy_enhancements

Conflicts:
	Global/UPnP/InstanceTracker.cs