bugfix: if no filename was set, a list of all files was loaded nedlessly, this is now fixed
Added IsUnknownUser property to user, to check wether the user referenced by a guid is no longer available in the system
Added the possibility to rename content class elements
put doxygen generated documentation in .gitignore
added template variant creation
initial log for next version
release 1.0.4.0
Merge branch 'develop'