[core] Add overridable game setting functionality (#2963)

Adds a place to override specific game settings for specific vendors

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2963
Reviewed-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Co-authored-by: Kleidis <kleidis1@protonmail.com>
Co-committed-by: Kleidis <kleidis1@protonmail.com>

src/core/CMakeLists.txt

@@ -17,6 +17,8 @@ add_library(core STATIC
     constants.h
     core.cpp
     core.h
+    game_settings.cpp
+    game_settings.h
     core_timing.cpp
     core_timing.h
     cpu_manager.cpp