when EXTERNAL_TEXTURES is defined, the texture hashmap in gfx_pc.c uses texture names as keys
all textures are precached on startup if EXTERNAL_TEXTURES is defined and 'precache' is true in the config
saves by default go into XDG_DATA_HOME/sm64pc
external data is read from the executable directory, if it's not found there on Unix systems the game will attempt to read it from some paths like /usr/local/share/sm64pc
both save data and readonly data fall back to other options in case of a problem
behavior can be overridden by specifying --datapath and --savepath on the CLI
both of those will expand the exclamation point ('!') to the executable path, e. g. --savepath '!/save'
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