GDScript: add builtin repeat()
An alternative to https://github.com/godotengine/godot/pull/16272, using repeat(x, n) to mean concatenate x n times. Works for all arrays, pool array, and string types.
An alternative to https://github.com/godotengine/godot/pull/16272, using repeat(x, n) to mean concatenate x n times. Works for all arrays, pool array, and string types.