[Open Assets] SHA-256 v1.1

Changelog:

• Fixed messages 32 bytes or longer producing incorrect hashes.
  • This was due to the SRB2 Lua API's unintuitive bitshifting behavior.
    In SRB2's Lua, x >> y actually acts more like x >> (y % 32).
    This is what I like to call a "bruh moment," and it should be fixed.