[NEW] devel/boxed-cpp

Hi,

I want to port Contour-terminal (https://github.com/contour-terminal/contour)
and this requires two libraries.

Here is the one of, boxed-cpp. Simply put into include/boxed-cpp/boxed-hpp.

ok?

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SASANO Takayoshi (JG1UAA) <uaa@mx5.nisiq.net>