stb__OMatch tables differ from stb_dxt v1.12

[nanley]

The tables in BC1_tables.inl seem to be generated from stb_dxt v1.10 or earlier. Version 1.11 of the header actually introduced such compile-time defined tables and a generation program. The tables from the latest header, version 1.12, differ from what's here. Could we pull them in?

[nanley]

The cause of the difference is from nothings/stb@425c4d8 (later fixed up with nothings/stb@3cfb892).

[darksylinc]

Interesting. Yes, it sounds like the new tables are superior and should be ported to Betsy.