Change EXIF metadata handling into a registered function

This allows much greater flexibility from templates regarding
EXIF metadata handling, no more hardcoded symbols. It's possible
to display essentially any attribute known to Exiv2. Please see
http://exiv2.org/metadata.html

This brings two new functions that can be called from templates:
 * get_exif_value (exiv2_attribute)
 * get_exif_value_fixed (exiv2_attribute)

Both functions take a string argument of metadata attribute name
from Exiv2 namespace. The difference is that get_exif_value_fixed()
does some extra formatting for several basic attributes
(e.g. datetime format).

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