Add ability to reorder event parameters to defined order

[itsschwer]

Event parameters in extracted event flows don't necessarily follow a consistent order, but the ordering of event parameters is persistent.

The ability to reorder these parameters (in the order defined in the actor definition(s) file) allows for easier comparison of event parameters when editing or creating event flows.

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This change is 

[leoetlino]

lgtm, rebase?

[itsschwer]

Rebased