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Amalgamate the forward declaration header (#3679)

* Amalgamate the forward declaration header

* Update CONTRIBUTING and PULL_REQUEST_TEMPLATE

* Update documentation
F
Florian Albrechtskirchinger committed
231f3108ff87a0b9afbf6592f0fa0a439dded3b0
Parent: dae5412
Committed by GitHub <noreply@github.com> on 8/7/2022, 11:57:32 AM