Implemented Win32 Threads
Also cleaned up POSIX threads and moved them to Platforms/General no need
for 3 extra copies of the same code.
Add Josh to my new Win32 source, most of the code was verbatim copied from
XLIB.
Add two new video functions.
Added Getter/Setter for video playback rate.
Implement asynchronous dialog events and update events.res
Add todo comments regarding map behavior.
Fix line ending.
More to do comments and cleanup.
async_load should be unsigned since that is what is returned by
ds_map_create
Merge pull request #634 from RobertBColton/master

Implemented Win32 Threads