Expose flags on MessageEdit so you can suppress embeds on other messa…

…ges (#973)

* Expose Flags on MessageEdit and add SuppressEmbeds

Also fix typo in the message flags enum

* Fix deprecation comment

* Add omitempty to Flags member

I wasn't sure if this was going to work but the documentation says:

> The "omitempty" option specifies that the field should be omitted from the encoding if the field has an empty value, defined as false, 0, a nil pointer, a nil interface value, and any empty array, slice, map, or string.

Therefore, if Flags is unmodified it will be omitted.

* Make Components omitempty

I think the null value here may be triggering the "Cannot edit a message authored by another user"

* Remove convenience function for now

* Move deprecated member out of list

Stops the gofmt error

* Fix golint issue

* Change deprecation comment

* feat: code review changes

Co-authored-by: nitroflap <fe.lap.prog@gmail.com>

message.go

@@ -199,7 +199,9 @@ const (
 	MessageFlagsCrossPosted MessageFlags = 1 << 0
 	// MessageFlagsIsCrossPosted this message originated from a message in another channel (via Channel Following).
 	MessageFlagsIsCrossPosted MessageFlags = 1 << 1
-	// MessageFlagsSupressEmbeds do not include any embeds when serializing this message.
+	// MessageFlagsSuppressEmbeds do not include any embeds when serializing this message.
+	MessageFlagsSuppressEmbeds MessageFlags = 1 << 2
+	// TODO: deprecated, remove when compatibility is not needed
 	MessageFlagsSupressEmbeds MessageFlags = 1 << 2
 	// MessageFlagsSourceMessageDeleted the source message for this crosspost has been deleted (via Channel Following).
 	MessageFlagsSourceMessageDeleted MessageFlags = 1 << 3
@@ -246,6 +248,7 @@ type MessageEdit struct {
 	Components      []MessageComponent      `json:"components"`
 	Embeds          []*MessageEmbed         `json:"embeds"`
 	AllowedMentions *MessageAllowedMentions `json:"allowed_mentions,omitempty"`
+	Flags           MessageFlags            `json:"flags,omitempty"`
 
 	ID      string
 	Channel string