Add support for updating media description and focus point when editing statuses (#3215)

* Add support for updating media description and focus point when editing statuses

* Don't publish description/focus point updates via the standard api when editing a published post

app/src/main/java/com/keylesspalace/tusky/entity/Attachment.kt

@@ -83,7 +83,9 @@ data class Attachment(
     data class Focus(
         val x: Float,
         val y: Float
-    ) : Parcelable
+    ) : Parcelable {
+        fun toMastodonApiString(): String = "$x,$y"
+    }
 
     /**
      * The size of an image, used to specify the width/height.

app/src/main/java/com/keylesspalace/tusky/entity/NewStatus.kt

@@ -26,6 +26,7 @@ data class NewStatus(
     val visibility: String,
     val sensitive: Boolean,
     @SerializedName("media_ids") val mediaIds: List<String>?,
+    @SerializedName("media_attributes") val mediaAttributes: List<MediaAttribute>?,
     @SerializedName("scheduled_at") val scheduledAt: String?,
     val poll: NewPoll?,
     val language: String?,
@@ -37,3 +38,13 @@ data class NewPoll(
     @SerializedName("expires_in") val expiresIn: Int,
     val multiple: Boolean
 ) : Parcelable
+
+// It would be nice if we could reuse MediaToSend,
+// but the server requires a different format for focus
+@Parcelize
+data class MediaAttribute(
+    val id: String,
+    val description: String?,
+    val focus: String?,
+    val thumbnail: String?,
+) : Parcelable