Big refactoring of the Inbox (#443)

* Big refactoring of the Inbox

We now have a type that routes an activity through the registered handlers
until one of them matches.

Each Actor/Activity/Object combination is represented by an implementation of AsObject

These combinations are then registered on the Inbox type, which will try to deserialize
the incoming activity in the requested types.

Advantages:
- nicer syntax: the final API is clearer and more idiomatic
- more generic: only two traits (`AsActor` and `AsObject`) instead of one for each kind of activity
- it is easier to see which activities we handle and which one we don't

* Small fixes

- Avoid panics
- Don't search for AP ID infinitely
- Code style issues

* Fix tests

* Introduce a new trait: FromId

It should be implemented for any AP object.

It allows to look for an object in database using its AP ID, or to dereference it if it was not present in database

Also moves the inbox code to plume-models to test it (and write a basic test for each activity type we handle)

* Use if let instead of match

* Don't require PlumeRocket::intl for tests

* Return early and remove a forgotten dbg!

* Add more tests to try to understand where the issues come from

* Also add a test for comment federation

* Don't check creation_date is the same for blogs

* Make user and blog federation more tolerant to errors/missing fields

* Make clippy happy

* Use the correct Accept header when dereferencing

* Fix follow approval with Mastodon

* Add spaces to characters that should not be in usernames

And validate blog names too

* Smarter dereferencing: only do it once for each actor/object

* Forgot some files

* Cargo fmt

* Delete plume_test

* Delete plume_tests

* Update get_id docs + Remove useless : Sized

* Appease cargo fmt

* Remove dbg! + Use as_ref instead of clone when possible + Use and_then instead of map when possible

* Remove .po~

* send unfollow to local instance

* read cover from update activity

* Make sure "cc" and "to" are never empty

and fix a typo in a constant name

* Cargo fmt

po/plume/pl.po

@@ -38,6 +38,9 @@ msgstr "Awatar {0}"
 msgid "To create a new blog, you need to be logged in"
 msgstr ""
 
+msgid "A blog with the same name already exists."
+msgstr "Blog o tej nazwie już istnieje."
+
 msgid "You are not allowed to delete this blog."
 msgstr "Nie masz uprawnień do usunięcia tego bloga."
 
@@ -204,8 +207,9 @@ msgstr "Nieobowiązkowe"
 msgid "Allow anyone to register here"
 msgstr "Pozwól każdemu na rejestrację"
 
-msgid "Short description - byline"
-msgstr "Krótki opis"
+#, fuzzy
+msgid "Short description"
+msgstr "Szczegółowy opis"
 
 msgid "Markdown syntax is supported"
 msgstr "Składnia Markdown jest obsługiwana"
@@ -222,7 +226,7 @@ msgstr "Zapisz te ustawienia"
 msgid "About {0}"
 msgstr "O {0}"
 
-msgid "Home to <em>{0}</em> users"
+msgid "Home to <em>{0}</em> people"
 msgstr "Używana przez <em>{0}</em> użytkowników"
 
 msgid "Who wrote <em>{0}</em> articles"
@@ -358,7 +362,7 @@ msgid "Subscribe"
 msgstr ""
 
 #, fuzzy
-msgid "{0}'s subscriptions'"
+msgid "{0}'s subscriptions"
 msgstr "Opis"
 
 #, fuzzy
@@ -381,7 +385,7 @@ msgid "Plume is a decentralized blogging engine."
 msgstr "Plume jest zdecentralizowanym silnikiem blogowym."
 
 #, fuzzy
-msgid "Authors can manage various blogs, each as an unique website."
+msgid "Authors can manage multiple blogs, each as its own website."
 msgstr "Autorzy mogą zarządzać blogami ze specjalnej strony."
 
 #, fuzzy
@@ -392,9 +396,6 @@ msgstr ""
 "Artykuły są widoczne na innych stronach Plume, możesz też wejść w interakcje "
 "z nimi na platformach takich jak Mastodon."
 
-msgid "Home to <em>{0}</em> people"
-msgstr "Używana przez <em>{0}</em> użytkowników"
-
 msgid "Read the detailed rules"
 msgstr "Przeczytaj szczegółowe zasady"
 
@@ -620,8 +621,9 @@ msgstr "Już tego nie lubię"
 msgid "Add yours"
 msgstr "Dodaj swoje"
 
+#, fuzzy
 msgid "One boost"
-msgid_plural "{0} boost"
+msgid_plural "{0} boosts"
 msgstr[0] "Jedno podbicie"
 msgstr[1] "{0} podbicia"
 msgstr[2] "{0} podbić"
@@ -805,6 +807,12 @@ msgstr "Skopiuj do swoich artykułów, aby wstawić tę zawartość multimedialn
 msgid "Use as an avatar"
 msgstr "Użyj jako awataru"
 
+#~ msgid "Short description - byline"
+#~ msgstr "Krótki opis"
+
+#~ msgid "Home to <em>{0}</em> users"
+#~ msgstr "Używana przez <em>{0}</em> użytkowników"
+
 #~ msgid "Login"
 #~ msgstr "Zaloguj się"
 
@@ -969,9 +977,6 @@ msgstr "Użyj jako awataru"
 #~ msgid "Invalid name"
 #~ msgstr "Nieprawidłowa nazwa"
 
-#~ msgid "A blog with the same name already exists."
-#~ msgstr "Blog o tej nazwie już istnieje."
-
 #~ msgid "Your comment can't be empty"
 #~ msgstr "Twój komentarz nie może być pusty"