commitmonitor Code

Add about dialog.

Remember and restore the main dialog size.

* Add Exit button to quit the application
* Closing the main dialog with the red X doesn't quit but hides the main dialog
* Pressing ESC also hides the dialog
* Change the OK button to "Hide"

Add some information about what is done in the progress dialog when fetching the diff.

Use custom icons for the tree view, not the ones from the system image list.

Add a button to fetch the latest commits on request.

Save the url info immediately after editing/adding an url.

Fetch the diff from the repository if it isn't already cached on disk.

Add minimize/maximize buttons to the main dialog.
A minimize will result in closing the dialog, the same as clicking on the OK button.

Clear the error after showing it.