Add a Timer control to Web projects

Web projects currently have no Timer control in the Web page designer's Library list. The Timer class can be instantiated from code, but users coming from desktop projects expect to drag a Timer onto a web page, set its Interval and Starts Automatically properties in the inspector, and implement its Tick event handler, just like on the desktop.

Add a Timer component to the Web page designer:

• A Timer entry in the Web Library list (non-visual, shown on a shelf below the page like the desktop designer).
• Inspector properties for Interval and Starts Automatically.
• A Tick event that can be implemented from the designer.
• Ticks run per browser session on the server; property changes made in Tick reach the browser automatically.