Added icons: Cythara, bluetoothterminal, wire and CarbonROM browser.

I added the following 4 icons. The Cythara icon is close to the original, just like for Wire. The crbrowser (default Browser of the amazing CarbonROM) is just as the other browsers and the bluetooth terminal is my own creation based on your termux icon.

I hope Wire is free enough. Do you mean by free, for free or free of properity parts? It's uploaded on https://github.com/wireapp/wire-android and you can use it without the google services. Nevertheless (as far as I know) you need still some properity liberies for compiling.