Add TGA v2.0 footer in TGA type file on export #1946
Save exported TGA file as v2.0 TGA file by appending TGA v2.0 footer at the end of the file as recommended by following:
This was causing issue (mapeditor/tiled#2013) when trying to load .TGA file exported from Aseprite into Tiled Map Editor (https://www.mapeditor.org/) because it uses QT library to load images, and QT doesn't support non-TrueVision 2.0 files (https://code.woboq.org/qt5/qtimageformats/src/plugins/imageformats/tga/qtgafile.cpp.html#186)
TGA v2.0 format is backward compatible and it doesn't affect applications that expect original TGA format file.
I have tested the fix myself, it fixes the issue (mapeditor/tiled#2013) and everything else is working as expected.