Handle BSD variables across different patches

[bucanero]

Some game patches, like NPEB01899, require that the CRC32 hash is calculated on one file, but saved on another different file.

:GAMEDATA
[Get CRC32 GAMEDATA (Required)]
set [crc32_GAMEDATA]:crc32

;dependency: METADATA

:METADATA
[Update CRC32 on METADATA (required)]
write at 0xc:[crc32_GAMEDATA]

For these patches to work, Apollo needs to handle and keep variable values across different patches.