Transfer Panel Details Without an Extra Layer of JSON Encoding (#14)

**Rationale:**

This made it harder to snoop on the traffic in the network monitor because it was encoded as a string.

**Changes:**

- Backend now accepts & provides the panel data as a JSON object rather than as a string
- Backend now supports compression
- Minor improvements to error handling
- Some panel structures were getting saved in the JSON when they weren't supposed to be (now this no longer happens)

Reviewed-on: #14
Co-authored-by: Sergey Savelyev <sergeysav.nn@gmail.com>
Co-committed-by: Sergey Savelyev <sergeysav.nn@gmail.com>

api/src/client/mod.rs

@@ -193,7 +193,6 @@ impl Client {
                     break;
                 }
             }
-            println!("Exited Loop");
         });
 
         Ok(outer_rx)