[PD-dev] removing [matrix~] as part of the default externals

Right now, [matrix~] from creb is included by default. I am thinking that it makes sense remove it as default, then have creb and cyclone versions included in subdirs of extra so that they can be used as [creb/matrix~] [cyclone/matrix~], or as [matrix~] by setting the path to the one you want.

Any objections?

.hc

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