Features in Graphics
* Replace the Color Box's "Reload Colors" button with a label stating the name and modified state of the color collection for these reasons:
1. It takes less precious vertical room.
2. Reloading is not that frequent an operation (undoing a color collection mutation would be more useful but is not supported yet anyway).
* Eat color drops (which are usually accidental drags from one of our child widgets) to prevent them from being pasted as text in the main window (by kpMainWindow::dropEvent())
* Remove kpColorPalette::colorCellsIsModifiedChanged() signal to reduce duplication
* Clear up comments about hiding the windowTitle() in both the Color and Tool toolbars