Eliminate the trigger command

[darozak]

Robots will be able to pass through doorways if they have an equipped key that allows them passage. They should also trigger charging stations and repair pods by walking into them. These changes will eliminate the need for a specific trigger command.

[darozak]

Removed the trigger command along with power stations and repair bays (https://github.com/darozak/Advolition/commit/cf18e787c9b6cee24bde695f791dd877a32ce728). I plan to give the robots the ability to generate their own power and repair themselves over time.