CameraMetaData(): properly compute "id"
CameraMetaData(): properly compute "id"

At least for Nikon D1, it is actually "Nikon D1 ",
with the space at the end. In some codepaths,
the spaces are trimmed, in some the are not.

Fix this by trimming them before appending the "id".

Noticed by Stefan Schöfegger.

Adding these 2 functions as private members of the
class caused some build issues, so at least for now
they'll be static inline.

LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,anarsoul/rawspeed,anarsoul/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,klauspost/rawspeed,klauspost/rawspeed,LebedevRI/rawspeed,anarsoul/rawspeed