Add robot.speed [R]

[ILLISIS]

Hi

I would like the ability to read a robot's speed in order to determine if a robot is working or waiting / hovering for something such as;

- The inventory being full in a spidertron
- A player standing on a ghost entity it is trying to build
- Cases like where the robot is trying to build a train on top of a ghost rail that is just outside of construction range or does not have items to build it

If I could check robot.speed and observe it to be zero I would be well on the way to knowing that a robot is not active.

Prior to 2.0, code, I was checking every 90 ticks and tracking robot positions to see if they have moved, with the 2.0 bot optimizations that has been thrown out the window a little bit as it is less accurate given that robots update less frequently.

[ILLISIS]

Rethinking this... It suffers from the same issue due to the update frequency.

I am going to try watching orientation over a few checks and making a determination on that.

[curiosity]

I would've expected this to be covered by status. Don't robots have that? Seems like it would be more informative than just speed, since robots always move at maximum possible speed anyway.

[ILLISIS]

Hey mate
Robots do not have `status`. That would be a better alternative as it would be the game saying everything is okay(robots are doing something) rather than needing to try and determine it at lua stage.

I have deemed it necessary to watch an attribute of the robots over a few ticks if this determination logic is to remain in lua.