Make clutch controller use the standardized WireLib.SendMarks

[AbigailBuccaneer]

Originally reported by @Garbius in the comments of #946:

The clutch entity doesn't use @Nebual's linking functionality. In particular this is nasty because it means the tool does its own synchronization of linked pairs rather than using WireLib.SendMarks like all the other entities which use links.

However, the clutch controller is somewhat different as it maintains links between pairs of other entities, rather than between itself and other entities. So the marks feature may need to be improved to handle this.

Alternatively, at the very least it should use net messages rather than usermessages for synchronization.