This changes the open parent directory, open recent, and open folder
16x16 icons to be more consistent with the other folder icons. This
also improves the other elements on these icons by adding tinting
and shading.
Wand Selection tool uses similar logic to the Bucket Tool. Flood filling
and threshold calculations to determine the affected area just in this
case we do not set the pixels of the selected area, instead we use
those pixels to alter the selection mask.
In the future we can probably abstract out the shared flood logic so
both tools can share the code.
This adds menu item icons for Add Mask, Flatten Image, Fit Image To
View, and Generic 5x5 Convolution.
This modifies the menu item icon for Swap Colors to make the action more
obvious and improve accessibility.
This is just a slight variation of `/res/icons/16x16/paste.png`, I've
removed the lines on the paper to make it look consistent with the
"New Image" icon, which is an empty piece of paper.
