* Bitmap encoder will now write a V3 header as default.
Introduces a new encoder option `SupportTransparency`: With this option a V4 header will be written with BITFIELDS compression.
* Add 4 and 16 bit images to the Identify test
* Add some useful links for bitmap documentation
* Add 32 bpp images to the Identify test
* Added further information on what will change for the encoder, if SupportTransparency is used.