commitmonitor Code

* Use a separate window for the diff viewer. That window has the scintilla edit control as a child window.
* Remember the size of the diff viewer between sessions.

Block the custom draw handler of the list control while the control data is updated/changed.

Check if the diff file can be shown as UTF8.

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.