Added angle value to the alert and Email

1. Added an option for setting the color of the trendline and the angle value
2. It is now possible to set the corner and shift for the angle value display

1. Added Push and Email notifications.
2. It is now possible to change the font size of the angle value
3. The indicator draws a trend line at the place the angle is calculated, for better visualization (this function can be disabled)
4. Added one more buffer, where the value of the current angle is stored at the zero bar. This is done to allow the angle value to be retrieved from an expert and to use this indicator in automated trading.