Add functors for IsPhoton, IsNotE, IsNotH, ShowerShape

Tara Nanut Petricrequested to merge
tnanut_neutral_functors into master

Defined in new file NeutralLike.h analogue to TrackLike.h.

Needs to be merged together with LHCb!3418 (merged).

Resolves #240 (closed)

Edited by Tara Nanut Petric

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