Enhancement of CSAR radio calls if SRS is used

[kaltokri]

At the moment the text messages which are printed on the screen are used for TTS, too. But this is not immersive and the numbers o the beacon and grid coordinates are hard to get in voice chat. So the idea is to use other text snippets for SRS. I'll try to implement it.

[Applevangelist]

Happy to have better comms ideas