Merged several modifications from master-branch.
Calculation of stack utilization revised
dramatically lowered worst critical zone in AMiRo-OS
All copyright forms updated to 2020.
slightly optimized thread sleep functions
Enhanced the #include tree. 'amiroos.h' is now the central header, which includes all dependencies.
Applied a file structure template to all source files.
Fixed a error that AMiRo-OS would not compile when AMIROOS_CFG_DBG was set to false.
updated all file headers to 2019
Introduced some basic stack introspection functionality to threads.According information is now given for the shell thread via the 'module:info' command.
All contents of the os/ folder has been moved one directory up.