1.6.0

Use pthread_exit to terminate threads on POSIX for compatibility with libs overriding
pthread_exit or using pthread_cleanup_push.

Add thread_enter and memory_thread_initialize to provide optional entry points for
memory system per-thread initialization.

Add hint flags to memory reallocation to optionally avoid copying to preserve old content.

Fix parsing of negative numbers in JSON/SJSON parser.

Unify macOS/iOS delegate_nswindow and delegate_uiwindow functions to delegate_window.

Support using SetThreadDescription (if present) to set thread name on Windows.

Change MacOSX platform names and identifiers to macOS (FOUNDATION_PLATFORM_MACOS).

Fix race condition in ring buffer streams read/write.

Use C11 atomics for all compilers (except Microsoft) instead of builtin or own implementations.
Add memory order control to all atomic operations.

semaphore_initialize and semaphore_initialize_named now return boolean success/fail indicator

Change object map to use semaphore for write operation instead of atomics. Also change
object map index to 32 bit, and object_t type to 32 bit.

Add a mock system to tests to simulate failing system calls.

Remove flag to memory allocation to allocate in low 32-bit address range on 64-bit systems.