feature-1483: SCHED attributes can be modified by default
feature #1483: Prevents deleting of NULL pointer
feature #1483: Simplify REQUIREMENTS compatibility check
feature #1483: Moved implementation of util functions to a cc file
feature #1483: Inline hints for simple util functions
Revert "feature #1483: Inline hints for simple util functions"

This reverts commit 2e72c6c68b751c08fab997bcd47f9271b0375ebe.