Generated `server_data.cpp/h` mostly unused

[Robyt3]

We compile around 800 LOC on the server side that are mostly unused. This includes embedding the paths of all sounds and images as strings in the executable.

AFAICT, only some weapon properties of the global data g_pData are used in https://github.com/ddnet/ddnet/blob/cc6d75d3926a20ef46c872cd004a6cb9be869ce6/src/game/server/entities/character.cpp on the server-side.