First pass of load files through an interface (to allow loading from memory, zip file etc). So instead of posix fopen/fread, using CommonFileIOInterface.

A fileIO plugin can override custom file IO operations. As a small test, load files from a zipfile in memory.
Default fileIO implementation is in examples/Utils/b3BulletDefaultFileIO.h
Affects URDF, SDF, MJCF, Wavefront OBJ, STL, DAE, images.

examples/SharedMemory/plugins/vrSyncPlugin/vrSyncPlugin.cpp

@@ -41,8 +41,7 @@ B3_SHARED_API int initPlugin_vrSyncPlugin(struct b3PluginContext* context)
 {
 	MyClass* obj = new MyClass();
 	context->m_userPointer = obj;
-
-	printf("hi vrSyncPlugin!\n");
+	
 	return SHARED_MEMORY_MAGIC_NUMBER;
 }
 
@@ -192,6 +191,4 @@ B3_SHARED_API void exitPlugin_vrSyncPlugin(struct b3PluginContext* context)
 	MyClass* obj = (MyClass*)context->m_userPointer;
 	delete obj;
 	context->m_userPointer = 0;
-
-	printf("bye vrSyncPlugin!\n");
 }