add: request-to-join communities

add: private joined communities setting
add: "void" community
add: ability to delete communities

crates/core/src/model/communities_permissions.rs

@@ -14,6 +14,7 @@ bitflags! {
         const MANAGE_POSTS = 1 << 3;
         const MANAGE_ROLES = 1 << 4;
         const BANNED = 1 << 5;
+        const REQUESTED = 1 << 6;
 
         const _ = !0;
     }