GenEvent: use references

Tadej Novak requested to merge tadej/athena:fix-genevent into master

Use references in GenEvent for hotspot operations. We're still hit by slow attributes retrieval. Will open a ticket for that soon.

Note that I did that blindly (some may be redundant), but I already see 2x the speedup in HITS merge. Relates to ATLASSIM-6384.

/cc @averbyts @jchapman @tlari @mbandier @ewelina

Edited by John Derek Chapman

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