Big repository reorganization

The code is divided in three crates:
- plume-common, for the ActivityPub module, and some common utils
- plume-models, for the models and database-related code
- plume, the app itself

This new organization will allow to test it more easily, but also to create other tools that only reuse a little part of
the code (for instance a Wordpress import tool, that would just use the plume-models crate)

plume-models/src/schema.rs

@@ -0,0 +1,174 @@
+table! {
+    blog_authors (id) {
+        id -> Int4,
+        blog_id -> Int4,
+        author_id -> Int4,
+        is_owner -> Bool,
+    }
+}
+
+table! {
+    blogs (id) {
+        id -> Int4,
+        actor_id -> Varchar,
+        title -> Varchar,
+        summary -> Text,
+        outbox_url -> Varchar,
+        inbox_url -> Varchar,
+        instance_id -> Int4,
+        creation_date -> Timestamp,
+        ap_url -> Text,
+        private_key -> Nullable<Text>,
+        public_key -> Text,
+    }
+}
+
+table! {
+    comments (id) {
+        id -> Int4,
+        content -> Text,
+        in_response_to_id -> Nullable<Int4>,
+        post_id -> Int4,
+        author_id -> Int4,
+        creation_date -> Timestamp,
+        ap_url -> Nullable<Varchar>,
+        sensitive -> Bool,
+        spoiler_text -> Text,
+    }
+}
+
+table! {
+    follows (id) {
+        id -> Int4,
+        follower_id -> Int4,
+        following_id -> Int4,
+    }
+}
+
+table! {
+    instances (id) {
+        id -> Int4,
+        public_domain -> Varchar,
+        name -> Varchar,
+        local -> Bool,
+        blocked -> Bool,
+        creation_date -> Timestamp,
+    }
+}
+
+table! {
+    likes (id) {
+        id -> Int4,
+        user_id -> Int4,
+        post_id -> Int4,
+        creation_date -> Timestamp,
+        ap_url -> Varchar,
+    }
+}
+
+table! {
+    mentions (id) {
+        id -> Int4,
+        mentioned_id -> Int4,
+        post_id -> Nullable<Int4>,
+        comment_id -> Nullable<Int4>,
+        ap_url -> Varchar,
+    }
+}
+
+table! {
+    notifications (id) {
+        id -> Int4,
+        title -> Varchar,
+        content -> Nullable<Text>,
+        link -> Nullable<Varchar>,
+        user_id -> Int4,
+        creation_date -> Timestamp,
+        data -> Nullable<Varchar>,
+    }
+}
+
+table! {
+    post_authors (id) {
+        id -> Int4,
+        post_id -> Int4,
+        author_id -> Int4,
+    }
+}
+
+table! {
+    posts (id) {
+        id -> Int4,
+        blog_id -> Int4,
+        slug -> Varchar,
+        title -> Varchar,
+        content -> Text,
+        published -> Bool,
+        license -> Varchar,
+        creation_date -> Timestamp,
+        ap_url -> Varchar,
+    }
+}
+
+table! {
+    reshares (id) {
+        id -> Int4,
+        user_id -> Int4,
+        post_id -> Int4,
+        ap_url -> Varchar,
+        creation_date -> Timestamp,
+    }
+}
+
+table! {
+    users (id) {
+        id -> Int4,
+        username -> Varchar,
+        display_name -> Varchar,
+        outbox_url -> Varchar,
+        inbox_url -> Varchar,
+        is_admin -> Bool,
+        summary -> Text,
+        email -> Nullable<Text>,
+        hashed_password -> Nullable<Text>,
+        instance_id -> Int4,
+        creation_date -> Timestamp,
+        ap_url -> Text,
+        private_key -> Nullable<Text>,
+        public_key -> Text,
+        shared_inbox_url -> Nullable<Varchar>,
+    }
+}
+
+joinable!(blog_authors -> blogs (blog_id));
+joinable!(blog_authors -> users (author_id));
+joinable!(blogs -> instances (instance_id));
+joinable!(comments -> posts (post_id));
+joinable!(comments -> users (author_id));
+joinable!(likes -> posts (post_id));
+joinable!(likes -> users (user_id));
+joinable!(mentions -> comments (comment_id));
+joinable!(mentions -> posts (post_id));
+joinable!(mentions -> users (mentioned_id));
+joinable!(notifications -> users (user_id));
+joinable!(post_authors -> posts (post_id));
+joinable!(post_authors -> users (author_id));
+joinable!(posts -> blogs (blog_id));
+joinable!(reshares -> posts (post_id));
+joinable!(reshares -> users (user_id));
+joinable!(users -> instances (instance_id));
+
+allow_tables_to_appear_in_same_query!(
+    blog_authors,
+    blogs,
+    comments,
+    follows,
+    instances,
+    likes,
+    mentions,
+    notifications,
+    post_authors,
+    posts,
+    reshares,
+    users,
+);