splash.png ->
    - used on the splash screen during app startup for released QGIS versions
    - typically a group photo from the last hackfest for unreleased QGIS versions
    - typically a pleasing map motif from a previous hackfest venue
dev-splash.png ->
    - used in the about dialog, typically a group photo from the last hackfest
    - migrates to the about photo when there is a release
    - used on the splash screen during app startup for unreleased QGIS versions
