updated all file headers to 2019
Introduced a switch to completely disable SSSP (thanks to S. Welzel)
Fixed an occasional error where 'struct tm' could not be resolved correctly.
Introduced some basic stack introspection functionality to threads.According information is now given for the shell thread via the 'module:info' command.
Minor fixes and enhancements.
Minor optimizations regarding memory utilization.
All contents of the os/ folder has been moved one directory up.