Mapper 19/210 fixes #816
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Mapper 19/210 fixes #816
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Various fixes for the later Namco mappers:
Add missing battery backup initialization to Mapper 210. Fixes #814
Fix mirroring settings in Mapper 210. Fixes #815
Add NES 2.0 submappers to Mapper 210 (submapper 1 with hardwired mirroring, submapper 2 with mapper-controlled mirroring) with fallback detection by CRC32. I'm not sure if any games actually need this; all the games on PCBs with hardwired mirroring seem to set the mirroring register bits correctly anyway, but it's nice to be accurate.
Implement Mapper 19's capability to map pages of the console's nametable RAM as CHR RAM (based on Mapper 218 implementation; untested because I don't know which if any games use it)