Change conditions for extended minimaps + dynamic load

[djevangelia]

Change the conditions for extended minimaps to fit randomizer and make loading dynamic. Implements/"fixes" #2403.

Changes have been made in line with the suggestions in the issue and comment:

• Graveyard always shows extended minimap. This could be adjusted according to entrance randomization settings.
• Gerudo Fortress now depends on Gerudo Card. If acquired while in Gerudo Fortress, the extended minimap will load when the textbox is closed. (I tried making it an item effect function, but the extended minimap would load and show before the textbox dims the interface, which was very ugly.)
• Lake Hylia minimap on scene entry reflects current water level. Water level function calls minimap load function on switch toggle and loads the appropriate minimap.

Changes have been made to the Lake Hylia water functions, but nothing regarding gameplay function. Rather just things like setting action function DoNothing if Morpha not killed (instead of always setting and running the water level function) and not checking Morpha kill in the water level function (because it has already been checked by the gossip stone - and surely, it shouldn't be needed there either, because DoNothing would be set if not killed?).

Also, I added static asserts to the sizes of z64_game_t, z64_link_t and z64_file_t because it's so easy to get lost when replacing unknown chars with the real members and getting very amusing bugs that are totally impossible to debug until you remember you tinkered with one such file.

Disassembly

Map_InitData NTSC 1.0 matching disassembly here https://gist.github.com/djevangelia/cc1bfe60ad98f9d4c4c6fc6aa6793f39

Testing

Tested in Ares recent nightly build.
Looks like this: https://www.youtube.com/watch?v=GaAn8YkbORA
I removed the Morpha requirement here, but have tested with it both before and after killing.

[fenhl]

For future reference, you can make GitHub link an issue using closes #2403 instead of fixes #2403 if you're not talking about a bug.