Create a few particle system presets

A few good particle system presets should be available in item library. A couple of really simple ones and a couple of little more complex ones. Implementation could be similar to how different models (Cube, Sphere, etc.) are done, i.e. by providing a short source template for each type. In component library we should probably have separate category "QtQuick3D Premade Particle Systems" or something along those lines, which contains these.

These should be designed by a technical artist, as they would know best what kind of preset particle systems make sense.