* patterns/texheaders: Added pattern for Arma 3 texHeaders.bin
* magic/arma3: Added texHeaders.bin magic
* patterns/texheaders: Added test file
* patterns/paa: Small improvements
Added extra data description, and better indication of internally compressed data mipmap data.
* patterns/a3: Moved Arma 3 patterns into common folder
* patterns/a3: Added pattern for MLOD P3D
* patterns/a3: Added pattern for RAP
* magic/arma3: Added P3D and RAP to magic file
* patterns/a3: Added test files for P3D and RAP
* patterns/a3: Small correction to type names in TexHeaders format