commitmonitor Code

* Use a vector to store the popup window slots. This avoids showing a popup in a position where a previous one is still showing.
* First draft of drawing the popup window.

Add parameter to configure the time the window will stay put.

Don't use ShowWindow(), use SWP_SHOWWINDOW instead in SetWindowPos() to prevent the window from stealing the focus.

Add class to show notification windows from the taskbar.
(not finished yet, this is the first draft)

If a class already exists, that's not an error.

Don't show a menu in the diff viewer.

Don't select a log entry when selecting a tree item.

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

Only update the view if the data *really* has changed.

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