Made Tag::from_u16, from_u16_exhaustive and to_u16 const #241
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I'm using image-tiff to write DNG files, using a lot of currently
Unknowntags as a result.For forward compatibility once some of these tags are defined (#47, #210), I'm using
Tag::from_u16_exhaustive.This patch changes the u16 conversion functions to be const functions so
Tagconstants can be defined from raw numeric ids without having to always define them asUnknown.