Splashscreens here are NOT directly used by PT. They are the SOURCE files.
The images here are converted into a header file to be #included with PT source code. The images are put into a binary format in the header file as a byte array. 
The reason for using the binary compressed format is that XPM files are too big and bloats the executable.
TO use a new splashscreen in PT:
1. Have the image ready, in jpeg, or png format (something compressed and compatible with Qt)
2. in the PT/tools/imgtoh/ directory, there is a imgtoh_* tool (specific to each platform)
3. run that tool on the file to convert it into a header file to include with PT. Example command format:
    ./imgtoh_mac ../../art/splash6_2x.jpeg ../../splash6_2x.h splash6_2x
4. The last variable is the name of the variable to be used in the generated header file.
