Add new Ada port: graphics/generic_image_decoder
The Generic Image Decoder (GID) is an Ada package for decoding a broad
variety on image formats from any data stream to any kind of medium.
Examples include in-memory bitmap, a GUI objecct, another stream, floating
point data for scientific calculations, a browser element or a device.
Animations are also supported. GID features:
* Standalone; requires no other libraries or bindings
* Completely portable - no OS, CPU, or compiler dependencies
* Task safe
* Free and open source
* Pure Ada95 (suitable for Ada2005 and Ada2012 projects)
Currently supports BMP, GIF, JPEG, PNG and TGA formats.