Update robot model

[markusgrotz]

The robot model deviates from the actual robot and hence the motion planing can collide with the robot frame or lead to self-collision

• [ ] Rotate wrist camera to reflect the new location of the wrist camera
• [ ] Extend gripper length to match the new gripper

[kaikwan]

Implemented in #36 Gripper model updated in this PR: https://github.com/au-rmr/robotiq/pull/2