Coding style
Fix check in -[OFDictionary_hashtable isEqual:]

Instead of checking the passed dictionary, this checked self, which of
course would always be of type OFDictionary_hashtable.

While at it, use -[isKindOfClass:] instead for the check.
README.md: Update Clang + ARM instructions
OFApplication: Only use argv if argc > 0
Split threading.h into threading.m and threading.h
PLATFORMS.md: Add bare metal ARM Cortex-M4
runtime/lookup.m: Minor improvement
OFFile: Small documentation improvement
Minor build system clean-ups
Don't use C11's noreturn

It causes just too much trouble: It breaks with some old versions of
Clang, where noreturn does not work correctly, and OS X headers break if
noreturn is defined, requiring an ugly and fragile workaround. It's just
not worth the trouble it causes, as the same functionality is available
through __attribute__((__noreturn__)).
Split threading.m into per-platform files
Add of_thread_set_name()
Fix MinGW32 build
OFThread: Configurable priority and stack size