Allow to manually override a puppet for each Kit. So to allow for designing when using ARM targets.

Right now, a qmlpuppet is used for each kit, and there is no option to change it to a different binary. Master even compiles its own puppet.

But if you are using ARM targets, and you try to design you get errors. So you need to switch targets, which is, in fact, time consuming. The error also, seems to indicate problems and it's kind of misleading. It's just a matter to point to a correct puppet.

Moreover, i think a global default puppet, recompileable at will and editable per-kit would be a better idea than recompiling puppets each time.