Program entry point. If a folder is dragged and dropped, its path is provided as an arg. Supports:
- Drag and drop a folder containing images (the frames).
- Drag and drop a set of images (the frames)
- Passing the image (frames) paths as arguments.
- Generating a default config file. Just do spa -config:filename.conf to have the default config dumped in the named file. (or just -config and default.conf is created.) The config file can be dragged in with images, placed inside the folder or named "default.conf" and sit alongside the spa.exe