TelemetryScheduler: add a save button

Previously you had to load the settings to the UAV every
time you started it.  This makes this gadget of pretty
limited usefulness.  Now you can save the settings persistently
to the UAV.

![screen shot 2013-06-23 at 10 51 58 am](https://f.cloud.github.com/assets/618346/692345/de28fbe8-dc1c-11e2-82f4-987571bb78ba.png)