Json vehicle state and apply paint packet (#416)

Converts the vehicle stored client side from a raw string to parsed json
data. This allows us to more easily edit the vehicle state serverside,
which I've started using in this PR for updating the state after a paint
packet.

---

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src/TNetwork.cpp

@@ -974,7 +974,7 @@ bool TNetwork::SyncClient(const std::weak_ptr<TClient>& c) {
                     res = false;
                     return false;
                 }
-                res = Respond(*LockedClient, StringToVector(v.Data()), true, true);
+                res = Respond(*LockedClient, StringToVector(v.DataAsPacket(client->GetRoles(), client->GetName(), client->GetID())), true, true);
             }
         }