Purpose

Enable shadow text in controls of text type

Description of change

The text in the control may also be shadowed using the following new attributes.

shadowAngle - the integral angle, in degrees, of the shadow text. Zero degrees is along the x-axis, increasing positive values from zero will rotate the shadow clockwise. Example:
```
<shadowAngle>45</shadowAngle>
```
shadowDistance - the number of pixels the shadow is offset from the normal (foreground) text. Example:
```
<shadowDistance>1</shadowDistance>
```
shadowColor - the color of the shadow. Example:
```
<shadowColor>FF0000</shadowColor>
```