For large ranges, this is faster than having the caller call setValue() for
each index in the range. Masks wholly covered by the range can be set to
the new mask value in one go, and the two masks at either end that are
partially covered can each set the covered range of bits in one go.
We already have a LICENSE file that covers the Zig Standard Library. We
no longer need to remind everyone that the license is MIT in every single
file.
Previously this was introduced to clarify the situation for a fork of
Zig that made Zig's LICENSE file harder to find, and replaced it with
their own license that required annual payments to their company.
However that fork now appears to be dead. So there is no need to
reinforce the copyright notice in every single file.
