JVET-S0257: SW Support of dumping 360 SEI messages to config files

Karsten Suehringrequested to merge
ksuehring/VVCSoftware_VTM:JVET-S0257-SwSupportOf360SEI into master

This MR is based on !1712 (closed) but moves the cfg writing into an own class, which makes the changes much more local.

Edited by Karsten Suehring

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