Add mineclone2, mineclonia and mineclone5 support

[JamesClarke7283]

This PR adds support for mineclone2 and related subgames.

It currently does not support the mg mod, but i will work to fix this.

[JamesClarke7283]

It should be good to go now @Calinou

[Calinou]

CI fails due to Luacheck errors:

Luacheck.................................................................Failed
- hook id: luacheck
- exit code: 1

Checking init.lua                                 4 warnings

    init.lua:36:7: value assigned to variable default_stone_sounds is unused
    init.lua:37:7: value assigned to variable default_metal_sounds is unused
    init.lua:40:24: accessing undefined variable mcl_sounds
    init.lua:41:24: accessing undefined variable mcl_sounds

Checking mg.lua                                   OK

Total: 4 warnings / 0 errors in 2 files

[JamesClarke7283]

CI fails due to Luacheck errors:

Luacheck.................................................................Failed
- hook id: luacheck
- exit code: 1

Checking init.lua                                 4 warnings

    init.lua:36:7: value assigned to variable default_stone_sounds is unused
    init.lua:37:7: value assigned to variable default_metal_sounds is unused
    init.lua:40:24: accessing undefined variable mcl_sounds
    init.lua:41:24: accessing undefined variable mcl_sounds

Checking mg.lua                                   OK

Total: 4 warnings / 0 errors in 2 files

Fixed

[Calinou]

Thanks!