Unreliable option on image, camera and map

[joao-avelino]

When streaming videos it's usually a good idea to do it using UDP. This is specially true if we are connected through Wi-Fi or other "unreliable" connection.

Since we were having problems visualizing the streams coming from our robot over Wi-Fi, we decided to make the Unreliable (UDP) option also available for Image and Camera displays. We also made it available for Map.

[wjwwood]

@joao-avelino have you seen #971?

[joao-avelino]

Hey there, @wjwwood!

Yes, I've seen #971, and this changes are based on it. #971 doesn't make the option available for Image and Camera displays, since they don't inherit from "MessageFilterDisplay" where the "unreliable option" is implemented in #971.

That's also true for the Map Display.

[NikolausDemmel]

I'm not sure what the Relation to MessageFilterDisplay is (i.e. should Camerw/Image/Map use MessageFilterDisplay), but the patch seems simple enough as it is.

I haven't tested it yet, but I would want to use it next time I am in the field with flaky WiFi, so +1.

[wjwwood]

@joao-avelino got it. I tested this and it looks good. Thanks!