Extend support for theming the gutter #233
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New theme setting: gutterSelectionBackground
Shadows the changes made for the initial gutter view theming.
Ideally would also add in gutterSelectionForeground colour to allow colour theming of the selected line numbers text too, but this seems to be a bit more complicated to implement (at the [GutterView drawRect] level), so leaving for now!
Note: this code also changes the default gutter selection color from the previous change. It now defaults to "softened" version of the background colour, rather than the selection colour.