This is something I missed when updating minizip, this mistake made it so resource packs didn't find any textures

In NandPaths.cpp, the `std::initializer_list<char>` of illegal characters has been turned into a `char[]` (similar to the one in GameList.cpp).

The reverse iteration in ResourcePack.cpp seemed to provide no benefits, and doing without it it seemed to have no ill effects.

Ranges Algorithms Modernization - Find

The inequality operator is automatically generated by the compiler if `operator==` is defined.

In BTEmu.cpp, `std::mem_fn` was not necessary for the predicate to compile.

Also update unzLocateFile to the minizip-ng 4.0.4+ signature and document new unused files.