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.

.gitignore

@@ -36,45 +36,18 @@ doc/html/
 doc/doxygen_*
 
 ## Build files
-CMakeFiles/*
-src/CMakeFiles/*
-src/Makefile
-src/android_version_githash.h
-src/android_version.h
-src/cmake_config.h
-src/cmake_config_githash.h
-src/cmake_install.cmake
-src/script/CMakeFiles/*
-src/script/common/CMakeFiles/*
-src/script/cpp_api/CMakeFiles/*
-src/script/lua_api/CMakeFiles/*
-src/util/CMakeFiles/*
-src/unittest/CMakeFiles/*
-src/jthread/CMakeFiles/*
-src/jthread/Makefile
-src/jthread/cmake_config.h
-src/jthread/cmake_install.cmake
-src/jthread/libjthread.a
-src/json/libjson.a
-src/lua/build/
-src/lua/CMakeFiles/
-src/cguittfont/CMakeFiles/
-src/cguittfont/libcguittfont.a
-src/cguittfont/cmake_install.cmake
-src/cguittfont/Makefile
-src/gmp/CMakeFiles/
-src/gmp/libgmp.a
-src/json/CMakeFiles/
-src/json/libjsoncpp.a
-src/sqlite/CMakeFiles/*
-src/sqlite/libsqlite3.a
-src/client/CMakeFiles/
-src/network/CMakeFiles/
+CMakeFiles
+Makefile
+!build/android/Makefile
+cmake_install.cmake
 CMakeCache.txt
 CPackConfig.cmake
 CPackSourceConfig.cmake
-Makefile
-cmake_install.cmake
+src/android_version.h
+src/android_version_githash.h
+src/cmake_config.h
+src/cmake_config_githash.h
+src/lua/build/
 locale/
 .directory
 .kdev4/
@@ -82,6 +55,7 @@ locale/
 *.kdev4
 *.layout
 *.o
+*.a
 
 ## Android build files
 build/android/assets