Sniffer bots enhancements

[ghost]

I think we should add for sniffers new two features, that may be helpful in better planning of searching resources in the ground.

First feature is simple flat ground checker, just like in Astronaut UI. It also should work like in Astronaut, and in the future there should be an option in C-BOT for that. This option shouldn't be depend of that option in scene:
EnableBuild type=FlatGround
That option should be only for Astronaut.

Second feature will be Spot cleaner. It will remove any Power-, Titanium-, Uranium- and Key#Spot, that lies under the bot. Better with simple animation, like WayPoints do after PracticeBot pass them.

Simulation: