Silverlight PathTextBlock

Converted to Silverlight 4, added WAV file format support, significant rework in content loading.

1) Transform now inherits from a generic DepencencyObject that implements INotifyPropertyChanged and simplifies DependencyProperty registration
2) Most transform properties are now DependencyProperties
3) Added Transform.Disabled property
4) Added 3D Perspective transform that accepts camera location (x,y,z) and direction of gaze in degrees
5) Updated sample with a perspective transform, a databound dot to represent the camera location (x,y), and some calculations to cycle through various viewing angles and camera locations. I disabled the sine transform as an example of that usage and because the wave is distracting with the other movement.

Fixed issue if a character doesn't exist in the font map and is specified in the text it will cause a null reference exception. Also added support for Run and LineBreak.

Fixed issue where PathTextBlock without a Transform specified would get a null reference exception.

Initial Release