[DEVELOPMENT ENVIRONMENT]
* NEW: Image editor: Grid configuration is now specific to each editor.
* NEW: Image editor: The grid configuration gets a sane default the first time it is toggled.
* BUG: Image editor: Resize the information tooltip for large coordinate values.
* NEW: Image editor: Draw the grid lines with foreground color.
* NEW: Welcome dialog: Use a lighter version of the blue color.
* NEW: Welcome dialog: Sound and animation on a few specific dates. :-)
* NEW: File creation dialog: Remember the size of new images.
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