#8 Image overlays

[Pnut V]

Allow image overlays within the program. Will be able to
use .GIF transparency to overlay, but also be able to let
the user select a color from any .jpg or .bmp file to be
transparent. Should also allow a "color feathering"
feature that makes a color range transparent based off
the original transparent color.

The dialog should show the picture, and allow a user to
click on the image for the color they wish to make
transparent.