Suggest to allow for an empty input in a color picker input slot.

[brianharvey]

During a discussion on the forum I found myself doing this:

I don't like that I had to use an ID block. So I have a two-part suggestion:

1. Show a downarrow in those input slots, to make it obvious that you can set the color by clicking on the slot. (Downarrow along with the default color.)

2. When you click the downarrow, you should get a menu with at least two rows, an empty one and the color picker (surrounded by a thin border of the white-ish menu background color). Possibly the menu could have more options, e.g., "random," "red," "orange," etc. Maybe the names of my 10-crayon or 20-crayon subsets? Or even just "white" and "black."

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Another suggestion: rename the below-the-line options of the PEN reporter to "HSBT (0-100)" and "RGBA (0-255)." (And similarly in the "_ OF COLOR _" block, etc.)