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/gl.po

@@ -39,6 +39,9 @@ msgstr "Avatar de {{ name}}"
 msgid "To create a new blog, you need to be logged in"
 msgstr ""
 
+msgid "A blog with the same name already exists."
+msgstr "Xa existe un blog co mismo nome."
+
 #, fuzzy
 msgid "You are not allowed to delete this blog."
 msgstr "Vostede non é autora en este blog."
@@ -216,8 +219,8 @@ msgid "Allow anyone to register here"
 msgstr "Permitir o rexistro aberto"
 
 #, fuzzy
-msgid "Short description - byline"
-msgstr "Descrición curta"
+msgid "Short description"
+msgstr "Descrición longa"
 
 #, fuzzy
 msgid "Markdown syntax is supported"
@@ -237,7 +240,7 @@ msgstr "Gardar axustes"
 msgid "About {0}"
 msgstr ""
 
-msgid "Home to <em>{0}</em> users"
+msgid "Home to <em>{0}</em> people"
 msgstr ""
 
 msgid "Who wrote <em>{0}</em> articles"
@@ -380,7 +383,7 @@ msgid "Subscribe"
 msgstr ""
 
 #, fuzzy
-msgid "{0}'s subscriptions'"
+msgid "{0}'s subscriptions"
 msgstr "Descrición"
 
 #, fuzzy
@@ -404,7 +407,7 @@ msgid "Plume is a decentralized blogging engine."
 msgstr "Plume é un motor de publicación descentralizada."
 
 #, fuzzy
-msgid "Authors can manage various blogs, each as an unique website."
+msgid "Authors can manage multiple blogs, each as its own website."
 msgstr "As autoras poden xestionar varios blogs desde un único sitio web."
 
 #, fuzzy
@@ -415,9 +418,6 @@ msgstr ""
 "Os artigos son visibles tamén en outros sitios Plume, e pode interactuar "
 "coneles desde outras plataformas como Mastadon."
 
-msgid "Home to <em>{0}</em> people"
-msgstr ""
-
 msgid "Read the detailed rules"
 msgstr "Lea o detalle das normas"
 
@@ -646,7 +646,7 @@ msgstr ""
 
 #, fuzzy
 msgid "One boost"
-msgid_plural "{0} boost"
+msgid_plural "{0} boosts"
 msgstr[0] "Unha promoción"
 msgstr[1] "{0} promocións"
 
@@ -840,6 +840,10 @@ msgstr "Copie para incrustar este contido nos seus artigos"
 msgid "Use as an avatar"
 msgstr "Utilizar como avatar"
 
+#, fuzzy
+#~ msgid "Short description - byline"
+#~ msgstr "Descrición curta"
+
 #, fuzzy
 #~ msgid "You need to be logged in order to create a new blog"
 #~ msgstr "Debe estar conectada para escribir un novo artigo"
@@ -1014,9 +1018,6 @@ msgstr "Utilizar como avatar"
 #~ msgid "Invalid name"
 #~ msgstr "Nome non válido"
 
-#~ msgid "A blog with the same name already exists."
-#~ msgstr "Xa existe un blog co mismo nome."
-
 #~ msgid "Your comment can't be empty"
 #~ msgstr "O seu comentario non pode estar baldeiro"