Support for Minecart Sensors

[AWebb3701]

Is your feature request related to a problem? Please describe.
I'm trying to execute commands as a player passes over an area, similar to how commands can be executed upon passing over a pressure plate.

Describe the solution you'd like
Allow minecart sensor blocks to be a commandblock that triggers when it activates due a minecart passing over it.

[Geitenijs]

Will add this to my to-do list. In the meantime you can just put a Minecraft command block underneath the minecart sensor.