Added Entityx to project

external/entityx-1.1.2/cmake/FindEntityX.cmake

@@ -0,0 +1,28 @@
+# Look for a version of EntityX on the local machine
+#
+# By default, this will look in all common places. If EntityX is built or
+# installed in a custom location, you're able to either modify the
+# CMakeCache.txt file yourself or simply pass the path to CMake using either the
+# environment variable `ENTITYX_ROOT` or the CMake define with the same name.
+
+set(ENTITYX_PATHS	${ENTITYX_ROOT}
+					$ENV{ENTITYX_ROOT}
+					~/Library/Frameworks
+					/Library/Frameworks
+					/usr/local
+					/usr
+					/sw
+					/opt/local
+					/opt/csw
+					/opt)
+
+find_path(ENTITYX_INCLUDE_DIR entityx/entityx.h PATH_SUFFIXES include PATHS ${ENTITYX_PATHS})
+find_library(ENTITYX_LIBRARY NAMES entityx PATH_SUFFIXES lib PATHS ${ENTITYX_PATHS})
+find_library(ENTITYX_LIBRARY_DEBUG NAMES entityx-d PATH_SUFFIXES lib PATHS ${ENTITYX_PATHS})
+mark_as_advanced(ENTITYX_INCLUDE_DIR ENTITYX_LIBRARY)
+
+if(ENTITYX_INCLUDE_DIR AND ENTITYX_LIBRARY)
+	set(ENTITYX_FOUND TRUE)
+else()
+	set(ENTITYX_FOUND FALSE)
+endif()