Trace skipped info sub-chunks
Add a cast to silence an MSVC warning
C11's alignas is also sufficient for SSE aligning
Test _Alignas with 16 instead of 4
Use gettimeofday if clock_gettime isn't available
Move some headers to include/

Note, these are not installed. Only headers in include/AL/ are installed.
Move threads.c to a separate source dir

This will eventually serve to build a static lib of common wrapper methods,
such as threads, mutexes, atomics, etc.
Move atomic method definitions to a separate common source
Check for C99 _Bool support
Use standard types for the RWLock