add command-line argument for example browser and shared memory app, --shared_memory_key=<int>

fix some shared memory issues, client uses attach/detach, server uses create/remove shared memory
implement CMD_RESET_SIMULATION

examples/SharedMemory/SharedMemoryCommands.h

@@ -37,7 +37,7 @@ enum EnumSharedMemoryClientCommand
 	CMD_SEND_DESIRED_STATE,//todo: reconsider naming, for example SET_JOINT_CONTROL_VARIABLE?
 	CMD_REQUEST_ACTUAL_STATE,
     CMD_STEP_FORWARD_SIMULATION,
-    CMD_SHUTDOWN,
+    CMD_RESET_SIMULATION,
     CMD_MAX_CLIENT_COMMANDS
 };