commitmonitor Code

Reorganize the main dialog.

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.

Put all urls which are part of an SVNParentPath below the tree node of the SVNParentPath entry.

Update the tree view text and state after a log message changes its state from 'unread' to 'read'.

Delete all diff files when a monitored URL is removed.

Delete the fetched diff with the revision entry in the list control.

Add button to delete a selected tree item (URL).

* create the main dialog with passing a parent window
* in the main dialog, send a message to the parent window when an unread message is shown so the parent window (the hidden window) can change the system tray icon to 'normal'.