Add Exif 2.31 tags

[nagix]

• Add the following tags defined in the Exif Version 2.31 specification:
  • TAG_ISO_SPEED (0x8833)
  • TAG_ISO_SPEED_LATITUDE_YYY (0x8834)
  • TAG_ISO_SPEED_LATITUDE_ZZZ (0x8835)
  • TAG_OFFSET_TIME (0x9010)
  • TAG_OFFSET_TIME_ORIGINAL (0x9011)
  • TAG_OFFSET_TIME_DIGITIZED (0x9012)
  • TAG_TEMPERATURE (0x9400)
  • TAG_HUMIDITY (0x9401)
  • TAG_PRESSURE (0x9402)
  • TAG_WATER_DEPTH (0x9403)
  • TAG_ACCELERATION (0x9404)
  • TAG_CAMERA_ELEVATION_ANGLE (0x9405)
• Add the following description methods:
  • ExifDescriptorBase.getBrightnessValueDescription()
  • ExifDescriptorBase.getTemperatureDescription()
  • ExifDescriptorBase.getHumidityDescription()
  • ExifDescriptorBase.getPressureDescription()
  • ExifDescriptorBase.getWaterDepthDescription()
  • ExifDescriptorBase.getAccelerationDescription()
  • ExifDescriptorBase.getCameraElevationAngleDescription()
• Check exceptional values (0 and 0xFFFFFFFFL) in ExifDescriptorBase.getSubjectDistanceDescription()
• In ExifDescriptorBase, order case blocks and corresponding methods in the same order as the TAG_* values are defined.
• Modify ExifSubIFDDirectory.getDateOriginal() and ExifSubIFDDirectory.getDateDigitized() to support reading TAG_OFFSET_TIME_ORIGINAL tag and TAG_OFFSET_TIME_DIGITIZED tag respectively.

[drewnoakes]

Great extensions and tidying 👍