Resolve "Factory for state blocks"

Closes #321 (closed)

src/state_block/state_block.cpp

@@ -66,6 +66,7 @@ WOLF_REGISTER_STATEBLOCK(StateBlock);
 WOLF_REGISTER_STATEBLOCK(StateQuaternion);
 WOLF_REGISTER_STATEBLOCK(StateAngle);
 WOLF_REGISTER_STATEBLOCK(StateHomogeneous3d);
+WOLF_REGISTER_STATEBLOCK_WITH_KEY(H, StateHomogeneous3d);
 
 StateBlockPtr create_orientation(const Eigen::VectorXd& _state, bool _fixed)
 {