[iQue] Match z_sram

[cadmic]

Notes:

• A wild trigraph appeared! IDO interprets ??= as # but EGCS does not
• I created SRAM_READ and SRAM_WRITE macros to wrap the iQue changes (thought this looked better than SRAM_READ_WRITE or something)
• The checksum seems to match better as a struct. This is backed up by MM I think, idk why they would memcpy if it was a plain field: https://github.com/zeldaret/mm/blob/74266850b09ac865cb2a9e5f208a903f4b5ec44c/src/code/z_sram_NES.c#L933
• This is one of the files affected by the EGCS bug, where some array members in structs don't work properly. I'm not sure there's a way to match both versions cleanly, I suspect the devs had to change the code to work around it