commitmonitor Code

Implemented issue #94: Enhancement: URL for browsing differences with revisions numbers

* add edit box for the web viewer url to the url dialog
* replace the strings in the url:
%revision - replaced with the new selected revision number
%url - replaced with the url of the project
%project - replaced with the project name
* open the browser with the web viewer url when requested by the context menu

Implemented issue #7: Custom action after commit detection

* add edit box for the command line string to execute to the url dialog
* replace the strings in the command line:
%revision - replaced with the new HEAD revision number
%url - replaced with the url of the project
%project - replaced with the project name
* execute the command line string when new commits are detected

Implemented issue #92: Enhancement: Ignore list of users

Make sure the tray icon gets properly restored if required.

Remove the option to automatically fetch the diff.

Check the svnrobots file only once, not for every received log message.

Add an update notification if a newer version of the CommitMonitor is available.

Make the comparison of the author names to determine own commits case-insensitive.
This implements issue #71.

Handle the WM_QUERYENDSESSION message.

Postpone the first check after the CommitMonitor is first started by one minute.
This implements issue #63.