Make-Bridge

(make-bridge xmit recv) -> bridge

xmit - transmit channel - channel
recv - receive channel - channel

Creates a bridge using two channels.

Example Usage:

(define west-to-east (make-channel))
(define east-to-west (make-channel))
(define west-bridge (make-bridge (output-chain west-to-east
                                              (trace-filter "west    "))
                                east-to-west))
(define east-bridge (make-bridge (output-chain east-to-west
                                              (trace-filter "    east"))