Draft: Merge branch 'mwilkins/dielectrons' into 'master'

Michal Krepsrequested to merge
cherry-pick-8d44c78b into Sim10

add decay files for dark-photon/true-muonium search in pi0/eta -> gamma (A` -> e+ e-)

See merge request !1068 (merged)

(cherry picked from commit 8d44c78b)

57236336 add decay files for dark-photon/true-muonium search in pi0/eta -> gamma (A' -> e+ e-)

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