commitmonitor Code

* use the correct icon for "show diff"
* Only change the tray icon if really something has changed, not every time the data needs to be saved.

Use different regex to also parse modified SVNParentPathList pages (modified by using the xsl file).

Fix compiler warnings.

Use predefined messages instead of using RegisterWindowMessage()

Show notifications on the tray when new projects (for SVNParentPathList based urls) and/or new commits for existing projects are detected.

Save the data even if no new entries are found but only the last-checked data was changed.

* use a better, reentrant reader/write section class
* refresh the UI in a timer interval

Handle the WM_TASKBARCREATED message.

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

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.