Add new claw to robot

[tcorbly]

A new demobot claw is being introduced as of 2025 Botball. This new claw should most likely become the default on the robot. Potentially adding a UI option to switch out different claws on a robot may be useful as well.

[navzam]

Since we already have a way to switch to different robots (Demobot and iRobot Create), should we just make "2025 Demobot" an entirely new robot?