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Color support in Tipsy Turtle

Tipsy Turtle uses 24-bit colors. The words `setpencolor` and `setbackground` require RPG triplets as arguments, like this:

        255 0 0 setpc /* to draw with bright red lines */

There is also a palette of 16 colors that can be accessed by index as follows:

        4 palette setpc /* has the same effect as above */

By default, the palette contains the same colors as in UCB Logo, namely: black, blue, green, cyan, red, magenta, yellow, white, brown, tan, forest (green), aqua(marine), salmon, purple, orange and grey. All of them can be changed with `setpalette`:

        51 51 51 0 setpalette /* make black softer */
        255 204 0 13 setpalette /* make orange lighter */

Last but not least, you can access the initial 16 colors by name by prefixing it with a hash sign, like so:

        #orange setbackground

The named colors can't be changed or added to, and `pencolor` or `background` always return RPG triplets, even if they were set from the palette or a named color.