Add common Wii SDK function signatures to the signature DB

The signature DB is very helpful for generating a symbol map for games
which don't ship with debugging symbols, since it includes signatures
for common SDK functions.

However, it isn't very complete and only contained signatures for GC
games -- the current database isn't very helpful for Wii games, which
still have a huge number of unknown functions even after using this DB.

Yet Wii games typically share a lot of code (since they all use the
SDK), and not having symbols makes it a lot harder to look into what
a game is doing… So this commit adds common Wii SDK function signatures
to the database, in order to make generated symbol maps a lot more
useful for Wii games.

The debug info comes from the debugging map that was left in the Wii
version of The Legend of Zelda: Twilight Princess. To avoid cluttering
the DB with game-specific debug info (even though it already contains
some game-specific symbols), some basic filtering was done on the
shipped symbol map:

    egrep '(section layout|\.a|m_Do|lib|Lib| OS)' tp-framework.map | grep -v Z2 > common-wii-sdk.map

Then this map was loaded in Twilight Princess, and "append to existing
signature file" was used to append the new hashes to totaldb.dsy.

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