VPChannelID setters return reference to *this

Gerhard Ravenrequested to merge
setter-return-this into master

add back returning reference to *this in VPChannelID setters, and qualify them as constexpr. This reverts the spurious removal in !645 (merged).

Validated by

  • Core Software
  • RTA
  • Simulation
Edited by Gerhard Raven

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