Use Ructe (#327)

All the template are now compiled at compile-time with the `ructe` crate.

I preferred to use it instead of askama because it allows more complex Rust expressions, where askama only supports a small subset of expressions and doesn't allow them everywhere (for instance, `{{ macro!() | filter }}` would result in a parsing error).

The diff is quite huge, but there is normally no changes in functionality.

Fixes #161 and unblocks #110 and #273

src/api/posts.rs

@@ -1,6 +1,6 @@
 use canapi::Provider;
 use rocket::http::uri::Origin;
-use rocket_contrib::Json;
+use rocket_contrib::json::Json;
 use serde_json;
 use serde_qs;
 
@@ -15,13 +15,13 @@ use api::authorization::*;
 use Searcher;
 
 #[get("/posts/<id>")]
-fn get(id: i32, conn: DbConn, auth: Option<Authorization<Read, Post>>, search: Searcher) -> Json<serde_json::Value> {
+pub fn get(id: i32, conn: DbConn, auth: Option<Authorization<Read, Post>>, search: Searcher) -> Json<serde_json::Value> {
     let post = <Post as Provider<(&Connection, &UnmanagedSearcher, Option<i32>)>>::get(&(&*conn, &search, auth.map(|a| a.0.user_id)), id).ok();
     Json(json!(post))
 }
 
 #[get("/posts")]
-fn list(conn: DbConn, uri: &Origin, auth: Option<Authorization<Read, Post>>, search: Searcher) -> Json<serde_json::Value> {
+pub fn list(conn: DbConn, uri: &Origin, auth: Option<Authorization<Read, Post>>, search: Searcher) -> Json<serde_json::Value> {
     let query: PostEndpoint = serde_qs::from_str(uri.query().unwrap_or("")).expect("api::list: invalid query error");
     let post = <Post as Provider<(&Connection, &UnmanagedSearcher, Option<i32>)>>::list(&(&*conn, &search, auth.map(|a| a.0.user_id)), query);
     Json(json!(post))