Improved drop down list usability. #89

This adds an optional indicator to the drop down lists (the right facing triangle), which greatly helps with the lists when either using inadquate colors (such as monochrome), or even when the colors are sufficient, you want to be able to distinguish which item is selected when there are only two items listed. (The colors are not necessarily sufficient to provide that guidance.)

This also allows any list to use indicates before and after the selected item, as well as any spacing for unselected items. The List has a slightly different API, whereas the DropDown uses a simpler DropDownSelectedSymbol to set a single rune.

This adds an optional indicator to the drop down lists (the right facing triangle), which greatly helps with the lists when either using inadquate colors (such as monochrome), or even when the colors are sufficient, you want to be able to distinguish which item is selected when there are only two items listed. (The colors are not necessarily sufficient to provide that guidance.) This also allows any list to use indicates before and after the selected item, as well as any spacing for unselected items. The List has a slightly different API, whereas the DropDown uses a simpler DropDownSelectedSymbol to set a single rune.

Thanks!

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Improved drop down list usability. #89

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