Make Prev/Next Segment UID classes standalone #155

Job	Run time
libmatroska x64 Debug Dynamic	1m 9s
libmatroska x86 Debug Dynamic	59s
libmatroska arm64 Debug Dynamic	1m 14s
libmatroska x64 Debug Static	57s
libmatroska x86 Debug Static	1m 20s
libmatroska arm64 Debug Static	1m 42s
libmatroska x64 Release Dynamic	1m 12s
libmatroska x86 Release Dynamic	2m 0s
libmatroska arm64 Release Dynamic	1m 17s
libmatroska x64 Release Static	1m 25s
libmatroska x86 Release Static	1m 32s
libmatroska arm64 Release Static	1m 25s
	16m 12s

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