… remove the last of the game-specific header files, … Part of P0186, funded by [Anonymous] and Blue Bolt.
Making it more obvious that it's Music *Room* code, not BGM code. Part of P0186, funded by [Anonymous] and Blue Bolt.
The `struct date` members in `scoredat_t` add a dependency on <dos.h> to the entire header file. Makes sense to move it out as early as possible. Part of P0133, funded by [Anonymous].