small Fixes, and Queue function Headers refs #1183
Merge branch 'rtcan' of https://openresearch.cit-ec.de/git/amiro-os.amiro-os into rtcan
startup prompt and module:info command now print the date in ISO format (YYYY-MM-DD).
CAN is now optional.If disabled, CAN start and stop functions are removed, SSSP startup stage 3 is skipped and RTC is not synchronized during startup.
All preprocessor directives without arguments (e.g. #endif) are now followed by a comment, indicating where it belongs to (e.g. the preceding #if).
Using a RTC is now no mandatory feature anymore, but optional
Shell: "fixed" the HOME and END escape sequences, which were not ANSI compliant.
Reordered some configuration files.The BOARD_VERSION macro has been removed. Instead the version is now encoded in the other BOARD_XXX macros.
Debug output functionality reintroduced:
From now on there is a distinction between kernel checks and AMiRo-OS checks.Kernel checks are much more critical and will not print anything on failure.AMiRo-OS checks print an error message and cause the according thread to exit execution immediately.
slightly optimized thread sleep functions
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