Clock implementation on Windows

Also git checked out the latest version of device.c for OS X for
reference.
Resolved errors

Windows implementation of clock.c now in platform folder. #98
Removed macros

Moved file to OS X platform folder. Fixes #98
Implemented callbacks for hardware change

See #87
Added comments
Debugging device.c
Callbacks implemented but needs cleaning
Added comments
Callback implementation finished

Fixes #86, #87
Merge branch 'master' of github.com:patrikohlsson/faudio into patrikohlsson-master

Conflicts:
	platform/macosx/device.c
	shared/clock.c
Merge branch 'patrikohlsson-master'