Improvements in StreamingSource schema

[CodeJjang]

1. sourceType: You can infer the working method from the streamingMethod (VideoStandard 1.0, 0.9 or stanag 4609), but I understood from din that you use it to know whether you receive video or metadata... wouldn't it be better to call it channelType then? Anyway, please make it enum (if it is really chosen from a set of fixed options).

If you need motivation why: I tried to create one today and I didn't know what string to put in.

1. You can also add validations on the IP and PORT section - they're bug-proned attributes... If I remember right you validated them in your code, but it's more proper to do it before the insertion to DB, just use the custom validations that Mongoose offer...

[motyros]

@dinzone you can use mongoose-validators