create a C/C++ plugin system for pybullet / C-API.

examples/SharedMemory/plugins/testPlugin/testplugin.cpp

@@ -0,0 +1,22 @@
+
+#include "testplugin.h"
+#include "../../SharedMemoryPublic.h"
+
+#include <stdio.h>
+
+B3_SHARED_API int initPlugin()
+{
+	printf("hi!\n");
+	return SHARED_MEMORY_MAGIC_NUMBER;
+}
+
+B3_SHARED_API int executePluginCommand()
+{
+	return 42;
+}
+
+
+B3_SHARED_API void exitPlugin()
+{
+	printf("bye!\n");
+}