JVET-AK0181: Fix to remove enabling of the DMVR encoder control when GOPbasedRPR is enabled

See merge request !2810

Add cmake option ENABLE_SEARCH_OPENSSL

See merge request jvet/VVCSoftware_VTM!2803

JVET-AK0194 related: add VPS to list of signed non-VCL NAL units

See merge request jvet/VVCSoftware_VTM!2808

JVET-AJ0170: Flag to indicate the direction of the signalled source picture intervals

See merge request jvet/VVCSoftware_VTM!2806

Remove macros of previous development cycle

See merge request jvet/VVCSoftware_VTM!2812

DSC corrections

See merge request jvet/VVCSoftware_VTM!2807

In the discussion of JVET-AK0194 it was pointed out and agreed that VPS should be added to VVC and HEVC.

Documentation contains instructions how to create keys. An untrusted key can be easily created by the user.

Specification requires initialization with bits equal to "1"

Due to the processing order of the decoder, NAL units always need to be stored, because the decoder
does not know yet, whether DSCI has arrived.

Also contains small fixed in error messages.

SEI related cleanups

See merge request jvet/VVCSoftware_VTM!2804