…1.0-dev

…into tape1708+1.0-dev

…into tape1708+1.0-dev

Demonstrates a new behavior for global effects with two features
  * any sound can independently control the "send" amount to an effect
  * other events that don't use the global effect won't interfere with the effect's parameters

This should make it a little easier to work with multiple streams to a single orbit when global effects are used.

This first commit demonstrates the idea with two new global effects: a tape delay and a gated reverb.

Example use in Tidal:
```
d1
 $ s "bd <~ ~ ~ cr> sn:2 <~ ~ ~ cr>" # release 1 # cut 1
 # gateverb 4 # gateverbd 0.5 # gateverbg 0.3 # gateverbr 1
 # gain 0.8

d3
 $ superimpose (### [bandf "[400,800,1300]", bandq 5])
 $ s "arpy*8" # up ("<0 0 3 -5>") # shape 0.2 # gain 0.8
 # tape 0.5 # taped 1 # tapefb 0.3 |*| speed 4
```

The reverb (using `room` and `size`) is now also a "send"-style effect, where `room` is the send amount.
`dry` has also been repurposed - it now controls the amount of dry sound in the final mix.  A zero value means you won't hear the original sound, but you can still use the various "send" parameters (like `room` `tape` `gateverb`) to get a processed "wet" sound.

Now all the global effects use sends, and should not be affected by other events on the same orbit that don't use effect parameters.

Tweaked GlobalDirtEffect.set so that unspecified (nil value) parameters are ignored when checking to see if a value has changed.

The fix in the previous commit has made the ugly workaround redundant.