Feature request: adding "use utf8" as default to obj files.

Hi Jon,

could you please add to the next Mason2 version - adding:

use utf8;

into each generated *.obj file?

It will not disturb current US/ASCII Mason2 users, but would greatly
helps others.

Sure, it is possible achieve it with my own plugin, what will
overwrite the output_class_header method, but it is really strange
writing plugin for such easy thing.

And you can take into consideration the: "use Encode qw(encode decode)" too...

thanx,
ak.

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