radiation plugin filter needs rework

[PrometheusPi]

The radiation plugin provides a method to filter particles using a particle attribute radiationMask to keep particles in the radiation calculation if they once fulfilled the conditions of the filter. However, there are some drawbacks:

• the filter functor only takes the particle and thus can not compute (and filter on) the global position.
• if the radiationMask is not used, defining a filter is still needed

It would be great, if a more flexile filter could be used and the filter pipeline is less hard coded.

[ikbuibui]

Looking into this