P-Code GROMs cannot be loaded

[eswartz]

From RvK:

. Also I saw that the “P-code GROM” file had to be renamed otherwise it does not load

(for people migrating from 1 version to the latest one “pcode_g0.bin” to “pCodeGroms.bin”)

[eswartz]

The main issue was just a stale GROM MD5 sum (using the new 'grom' algorithm rather than 'full').

Along the way I also fixed some spaghetti that made it hard to handle both the ways the DSR ROMs are found: pcode_r0 (4k common) / pcode_r1 (8k, banks 0 and 1) split and the pcode_c.bin (8k, common + bank 1) and pcode_d.bin (8k, common + bank 2) arrangement.

[eswartz]

Interesting how github closes things sometimes but not always.