* Add minimal tga image loader
* Update TGA class ,add support for importing tga texture files and generate mipmap from tga images
* Add copyright and resource links
* Partial Add SaveImage
* Move TGAReader/Writer outside of TGA.cs
* Add check to return early when `DataTypeCode` is set to NO_DATA
* Add support for loading ExtensionData
* Change PNG signature check more clear
* Remove unnecessary using statements
* Move Debug stuff into Debug methods and call LoadImage before LoadFooter
* Update TGAReader
* Update TGA Reader/Writer
* Remove TGATimeSpan and use TimeSpan and DateTime instead
* Update TGAHeader member varible name and type
* Update TGA- Reader/Writer Constructor to not accept boolean flag 'useLittleEndian'
* TGAReader - Optimized 'TGA_HandleRGB'
* TGAReader - Update and rename 'TGA_HandleRLE_RGB'
* TGAWriter - Remove RLE RGB from switch statement
* TGA - Add TGA.FromFile, Move TGADataTypeCode to its own file
* Move Header, Footer and ExtentionData to there own cs file
* Move Tga files into IO folder
* Changed visibility of tga related classes to internal
* TGA - Only support reading/writting of raw RGB 32 bit images
* Update IO/TGA classes
