commitmonitor Code

Start the internal diff viewer if it isn't configured otherwise in the registry.

Add a diff viewer based on scintilla.

Reorganize the main dialog.

After editing an url entry, set the lastchecked entry to 0 so it gets checked again on the next timer.

This is a bigger change:
* only use one instance of CUrlInfos
* pass around that one instance to wherever it's needed
* guard the data in CUrlInfos with critical sections
* make sure the data is guarded only for short times
* in the monitoring thread, use a copy of the CUrlInfos data because of the point above

Implement resizing the log message view.

Remove the variable m_bThreadRunning from the main dialog: the main dialog doesn't have a thread.

Keep track of the main dialog shown. If it is shown while the thread is running, discard (do not save) any change in the url data which the thread might have done.

* Only load the info data from disk when the thread starts.
* Don't save the url info data as long as the main dialog is visible.

Try to stop a possible running thread gracefully before exiting the process.