Hi Anton,

it is debatable whether this is a declaration.

This is telling the compiler to include the implementation for these (*RecHit) classes.
In other words, an alternative to moving implementation to the header.

It is very similar to including "MakerMacros.h" and defining the plugin at the bottom of the implementation file. I can move it up, if you still want to.

I also plan to rewrite and clean selectors later, to use either inline lambdas or vectors.
For now I just want to push this, because of large amount of files changed.