commitmonitor Code

Implemented issue #117: (Enhancement) Allow to reload revision details
* add context menu to the tree control to 'mark' the repo for a complete refresh on the next check
* when refreshing a repository, keep the 'read' state of the refreshed entries

Implemented issue #106: "Ignore users" isn't considered when executing "Script/Command"

Implemented issue #94: Enhancement: URL for browsing differences with revisions numbers

* add edit box for the web viewer url to the url dialog
* replace the strings in the url:
%revision - replaced with the new selected revision number
%url - replaced with the url of the project
%project - replaced with the project name
* open the browser with the web viewer url when requested by the context menu

Implemented issue #7: Custom action after commit detection

* add edit box for the command line string to execute to the url dialog
* replace the strings in the command line:
%revision - replaced with the new HEAD revision number
%url - replaced with the url of the project
%project - replaced with the project name
* execute the command line string when new commits are detected

Implemented issue #92: Enhancement: Ignore list of users

Add option to disable the update check.

Bugfix: Clicking on the "Show Diff" button did not respect the setting "Use TortoiseSVN for showing diffs" but always unconditionally used TortoiseSVN.

Additionally: Two functions (OnDblClickListItem and DoCommand) which interpreted the setting have been refactored to use the new ID_MAIN_SHOWDIFFCHOOSE command.

Add an update notification if a newer version of the CommitMonitor is available.

Set the default entry in the list control context menu correctly depending on the diff settings.
This fixes issue #59.

Add entry "Check now" and "Options" to the system tray icon context menu.

This implements issue #51.