Add initial support for SAP type R POKEY export. #1706
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This format is of increasing interest in the Atari 8-bit scene due to the existence of an efficient decompression+player routine which uses it as input. It's essentially a more bare-bones VGM. The resulting files can also be played directly by the Altirra emulator.
The exporter could probably be improved somewhat (exporting two POKEY chips to two files for stereo playback, for example - an use-case implemented by the RMT->LZSS converter), but I've done this as a proof of concept for a friend. In addition, the above-mentioned playroutine's compressor does not actually parse the header, and a lot of standalone .SAP players don't handle Type R, so I haven't put much effort into populating it wholly.
Due to the niche usecase, I won't feel sad if it doesn't get merged, don't worry. (However, it could serve as a base for a ROM export functionality for the platform in the future...)