Two simple decoders for Retro computing processors

[electrickery]

Recently I completed two Retro computing decoders, one for the MC6809 and one for the TMS7000.
These decoders are PRed at sigrokproject/libsigrokdecode#130, but I am not sure that is upstream from here. Should I PR them here too?
These decoders only add visualisations of address and data values, both read and write. No attempt to add disassembly. This is already very useful for debugging hardware and software as well as a help in annotating disassembled code.

[gusmanb]

Cool, I usually update the analyzers from Sigrok whenever I do a new release, I will include them :)