Exiv2

Contributed by Joachim Gelhaus, Cewe Color:

The attached patch adds the ability to read ICC color profile out of the JPEG
APP2 marker as just a bunch of bytes.

• All modified sections are marked with an #ifdef JGE_ICC_PATCHES which
  is defined in the exv_conf.h file.
• Class ICCColorProfile has been added to types.h (just a simple
  wrapper to a byte*. Similar to DataBuf)
• JpegBase got two new static const members: app2_ and iccId_[]
• The Image class has two new functions: setIccData(const
  ICCColorProfile & newIccData); and ICCColorProfile& iccData() { return
  iccData_; }
• The most changes are in jpgimage.cpp readMetadata() and
  writeMetadata()