Switch to async-std, refractor notifications code.

src/notifications/events.rs

@@ -0,0 +1,67 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(tag = "type")]
+pub enum Notification {
+    MessageCreate {
+        id: String,
+        nonce: Option<String>,
+        channel: String,
+        author: String,
+        content: String,
+    },
+
+    MessageEdit {
+        id: String,
+        channel: String,
+        author: String,
+        content: String,
+    },
+
+    MessageDelete {
+        id: String,
+    },
+
+    GroupUserJoin {
+        id: String,
+        user: String,
+    },
+
+    GroupUserLeave {
+        id: String,
+        user: String,
+    },
+
+    GuildUserJoin {
+        id: String,
+        user: String,
+    },
+
+    GuildUserLeave {
+        id: String,
+        user: String,
+        banned: bool,
+    },
+
+    GuildChannelCreate {
+        id: String,
+        channel: String,
+        name: String,
+        description: String,
+    },
+
+    GuildChannelDelete {
+        id: String,
+        channel: String,
+    },
+
+    GuildDelete {
+        id: String,
+    },
+
+    UserRelationship {
+        id: String,
+        user: String,
+        status: i32,
+    }
+}