This patch will disable key buttons while slewing to address a problem I have...

This patch will disable key buttons while slewing to address a problem I have had many times when using kstars, particularly with the align module.
I often hit the button before it is ready because there is no definitive indication on the screen that it has arrived at the location.  So I wrote some code that will disable the buttons in question while the telescope is slewing and then re-enables them afterward.

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