VDR Plugin 'osdimage' TODO
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Probable Long-term goals:
 - Full-screen-view for the 256-color-mode
 - Make it possible to enter the picture-directory in the setup-menu 
 - support different aspect ratios in 16-color-mode (selectable in the setup)
 - multi-picture-view
 - zooming
 - alternative quantizing-engine (faster and/or better quality)
 - more OSD-Info (i.e. EXIF)
 - jump to pictures by entering the respective number
 - evaluate the ENV-variables in the passed parameter
