+slot1 rebinds to detpipe when all pipes are out

[RicksonFOLD]

Sometimes as a demoman you want to fire pipes out even when there's a full 6-pipe trap set, which is understandable. However, more often than not, one simply wants to detonate the trap. Currently I have one key bound to fire pipes, and a separate key bound to detonate. I would like the option to toggle the ability to have the same key shoot pipes and detonate pipes once 6 pipes are out. So the key bind (perhaps call it +pipedet) would fire a pipebomb until 6 were out. Once 6 are out, it would detonate the trap. Then pressing it again would fire a pipe, etc. Also, another new key bind (perhaps call it +pipelay) would function as the alternative to a detonation key. When 6 pipes are out, it would fire another pipe. But when there are less than 6 pipes out, it would function as detpipe.