This patch fixes several things you asked me to take a look at.

First, it changes the color of the center telescope cursor to red to make it more visible when trying to center the telescope.
Second, it makes the center Telescope Cursor switch back to whatever cursor you had before after you start a slew and will reset whatever button was checked to make the center telescope function work.
Third, the floating toolbar looked like buttons were not checked when in fact they were checked, so I adjusted the colors a bit. This fix had an extra benefit of making the toolbar a little smaller, matching the button size.
Finally, I changed the mouse cursor for the Preview view to be drag mouse, just like the fits viewer.

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