need "set console background color"

[jasonsikes]

The canvas has SETBACKGROUND.

UCBLogo has SETTEXTCOLOR where the foreground and background are applied to the entire text console.

Qt allows multiple colors in one text window (along with multiple fonts and sizes). However, changing the text background color looks weird because it doesn't apply to the characters already printed.

An attempt was made to mitigate that by applying the text background color to the empty space in the text-area (by use of QBrush and QPalette), but it's still incomplete.

QLogo needs a SETTEXTBACKGROUND so that the user has more flexibility to apply colors.