Before this commit mTimer depended on Minetest Game’s `default` mod just
for the reason because it was common practice depending mods on it.
Since Minetest Game will be discontinued and put in maintenance mode
mTimer was sucessfully tested to run without the `default` dependency.
Tests were done using “Development Test” and paramat’s “minipeli”.
https://github.com/minetest/minetest/tree/master/games/devtesthttps://github.com/paramat/minipeli
