Currently we have three files to store game values if you don't count default.cfg

All the usage of those variables can be found using the following links.

Since we only use CFG_GET_VAL which is a macro:

g_ConfigDB.GetValue(CFG_USER, name, destination)

We could nuke the other two files as we barely read nor need them.

Usage across the codebase

​https://github.com/0ad/0ad/search?utf8=%E2%9C%93&q=CFG_GET_VAL&type=
​https://github.com/0ad/0ad/search?utf8=%E2%9C%93&q=CFG_MOD&type=
​https://github.com/0ad/0ad/search?utf8=%E2%9C%93&q=CFG_USER&type=
​https://github.com/0ad/0ad/search?l=C%2B%2B&q=CFG_SYSTEM&type=&utf8=%E2%9C%93
​https://github.com/0ad/0ad/search?utf8=%E2%9C%93&q=g_ConfigDB&type=

Since we use g_ConfigDB everywhere else we could also nuke the macro

User can test that no values are loaded from local.cfg and mod. cfg.

No values are written to local.cfg and mod. cfg.