want to mix too much cleanups into real changes.
* Got rid of the weird lines between rows.
* Tweaked colors (selections are usually dark everywhere else in Haiku).
* Implemented slightly tinting alternating rows.
* Removed the code duplication to figure out the appropriate background
row color, fixed some inconsistencies between Draw() and RedrawColumn()
in this regard.
TODO: Default colors should be computed based on current panel color though.
TODO: Figure out why the outline view does not scroll (at least not visibly)
when the vertical scroll bar is used.
TODO: Remove remaining redraw bugs. I observe a column of pixels not being
updated in some cases when resizing columns.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24033 a95241bf-73f2-0310-859d-f6bbb57e9c96