Migrated rpdata-api to using go modules and a more recent version of

gqlgen

Squashed commit of the following:

commit 162ccf6bfb
Author: Gisle Aune <dev@gisle.me>
Date:   Fri May 17 11:51:23 2019 +0200

    The great module madness continus, now with pointers.

commit 7e3dc49635
Author: Gisle Aune <dev@gisle.me>
Date:   Thu May 16 15:57:08 2019 +0200

    Basic stuff, doesn't compile

internal/loader/channel.go

@@ -11,13 +11,13 @@ import (
 )
 
 // Channel gets a character by key
-func (loader *Loader) Channel(key, value string) (models.Channel, error) {
+func (loader *Loader) Channel(key, value string) (*models.Channel, error) {
 	if !strings.HasPrefix(key, "Channel.") {
 		key = "Channel." + key
 	}
 
 	if loader.loaders[key] == nil {
-		return models.Channel{}, errors.New("unsupported key")
+		return nil, errors.New("unsupported key")
 	}
 
 	loader.loadPrimed(key)
@@ -25,15 +25,15 @@ func (loader *Loader) Channel(key, value string) (models.Channel, error) {
 	thunk := loader.loaders[key].Load(loader.ctx, dataloader.StringKey(value))
 	res, err := thunk()
 	if err != nil {
-		return models.Channel{}, err
+		return nil, err
 	}
 
 	channel, ok := res.(models.Channel)
 	if !ok {
-		return channel, errors.New("incorrect type")
+		return nil, errors.New("incorrect type")
 	}
 
-	return channel, nil
+	return &channel, nil
 }
 
 // PrimeChannels primes channels for loading along with the first one.