Switch desktop/emscripten builds from SDL2 to SDL3, applying only the
API changes that cannot compile through the SDL_oldnames.h aliases. Pure
renames will be swept in a follow-up commit.
Dri::load_mda() referenced 26 of the built-in MDAs without the ".MDA"
suffix, so open_resource() never found them.
Also add the missing cases for Rance 4 and Gakuen KING.
AG00.DAT on the hint disk must be renamed to GG00.DAT to avoid conflicts
with AG00.DAT of the main game. This is the setup used in the Ryu1's
porting kit (http://www.ryu1.jp/alice/r2port.html).
- On Android, MDAs are now loaded from APK assets.
- On Mac/Linux, MDAs are now installed by 'make install', and loaded
from installation directory.
- MDAs and fonts are moved into a new toplevel directory, resources/.
FILEIO has been updated to resolve relative paths inside FILEIO::Fopen(),
which has been already done in System3-sdl2.
FILEIO::Fgets() now uses a length param.
Callsites for these functions are also updated to reduce the diff from
upstream.
kichikuou