feat: out-of-box experience (#2)

Reviewed-on: https://git.reya.su/reya/signed/pulls/2

crates/signed_core/src/lib.rs

@@ -1,10 +1,18 @@
 pub mod addr;
+pub mod annotations;
 pub mod clone_url;
+pub mod comments;
+pub mod deletions;
 pub mod filters;
 pub mod model;
+pub mod state;
 pub mod status;
 
-pub use addr::RepoAddr;
+pub use addr::{RepoAddr, repo_addr};
+pub use annotations::{COVER_NOTE_KIND, cover_note, labels_and_subject, subject_override};
 pub use clone_url::{CloneTarget, parse_clone_url};
-pub use model::Announcement;
+pub use comments::{CommentThread, comment_threads};
+pub use deletions::Deletions;
+pub use model::{Announcement, activity_subject, pull_request_patch};
+pub use state::{build_state, parse_state};
 pub use status::{RepoStatus, references_root, resolve_status};