Improvements to NES & IPS, add SNES, NSF, NSFe #455
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I did some fixes to IPS and NES, and added mappers for the latter.
I also added my patterns for the SNES header, NSF, the format of files that contain NES music, and NSFe, an old expanded version that was the origin of metadata used in NSF 2.0 (supported in the NSF pattern).