Improved "Paint Mode"

[desmondc474]

Another issue on here suggests adding a "Selection Mode", that lets you copy/paste/etc parts of the image, and dubs the current default mode "Paint Mode". After having downloaded this IDE and played around with it a little, I think I also have some ideas for improving the Paint Mode:

• Line tool that draws a straight vertical or horizontal line of the selected color
• Rectangle tool that lets you draw a solid box of a given color
• Bucket tool that fills a contiguous area of one color with a different color, MSpaint style
• Something to show how many pixels are in a given color block, either when you hover over it or as some sort of overlay on the pixels