Clean up threading

* Rename everything.
    * Strip J prefix.
    * Change UpperCamelCase functions to lowerCamelCase.
  * Remove global (!) semaphore count mutex on OSX.
  * Remove semaphore count getter (unused, unsafe, depended on internal
    API functions on Windows, and used a hack on OSX).
  * Add `Atomic<type>`.
  * Make `Thread` handle thread names.
  * Add support for C++11 multi-threading.
  * Combine pthread and win32 sources.
  * Remove `ThreadStarted` (unused, unneeded).
  * Move some includes from the headers to the sources.
  * Move all of `Event` into its header (allows inlining with no new includes).
  * Make `Event` use `Semaphore` (except on Windows).
  * Move some porting functions into `Thread`.
  * Integrate logging with `Thread`.
  * Add threading test.

src/settings.h

@@ -22,7 +22,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "irrlichttypes_bloated.h"
 #include "util/string.h"
-#include "jthread/jmutex.h"
+#include "threading/mutex.h"
 #include <string>
 #include <map>
 #include <list>
@@ -225,8 +225,8 @@ private:
 
 	std::map<std::string, std::vector<std::pair<setting_changed_callback,void*> > > m_callbacks;
 
-	mutable JMutex m_callbackMutex;
-	mutable JMutex m_mutex; // All methods that access m_settings/m_defaults directly should lock this.
+	mutable Mutex m_callbackMutex;
+	mutable Mutex m_mutex; // All methods that access m_settings/m_defaults directly should lock this.
 
 };