Begin console individual labels, colors & reuse

[jacobsorme]

See #791 & #809

Begin try making console rows/entries individual labels, to:

• Support individual entry colors, style
• Possibly improve console scroll-stick-to-bottom logic

Current limitations:

• lbl.SetColor(matrix.ColorAquamarine()) isn't showing, unsure why. I've tried other approaches than using .Clone on an element, like building manually, but gotten stuck in nil pointer issues

Fixed in 90cc059. Had to use EnforceFGColor, otherwise the entries got their color from parent (setChildTextColor(elm, color) override)

• Hard coded 1000 limit on the entries, no history of past

Thoughts:

• I guess it's possible (as discussed in #791 Fix console scroll stick #809) to keep a history ([]string?), detect scroll up at the top and then shift currently showing entries downward. However, would this make the scroll look "discrete" and not "continuous" (shift/scroll whole rows, not fractions)?
• Would the scroll bar at the side reflect the real number of entries if we cap visually? Maybe that's not an issue?

Feedback welcome!