[PlanetCCRMA] Add Carla and Cadence

[ycollette.nospam at free.fr]

Hello,

Is it possible to add some new packages to planet CCRMA ?
Here: https://github.com/ycollet/fedora-spec
I added some new packages for fedora.
In these packages, I added Carla (a Rack + Patchbay) and Cadence (a "replacement" to qjackctl). These 2 packages come from kxstudio.
>From kxstudio, I also added helm (a really nice synth) and DISTRHO (a set of synth / effects - these packages need premake3 to compile).

These packages build using mock under fedora 21.
I hope that I do'nt miss any requires ...

Best regards,

YC