Remove "I AM NOT DONE" and the verify mode and add AppState

tests/fixture/state/exercises/pending_exercise.rs

@@ -1,7 +1,5 @@
 // fake_exercise
 
-// I AM NOT DONE
-
 fn main() {
 
 }

tests/fixture/state/exercises/pending_test_exercise.rs

@@ -1,4 +1,2 @@
-// I AM NOT DONE
-
 #[test]
 fn it_works() {}

tests/integration_tests.rs

@@ -1,7 +1,6 @@
 use assert_cmd::prelude::*;
-use glob::glob;
 use predicates::boolean::PredicateBooleanExt;
-use std::{fs::File, io::Read, process::Command};
+use std::process::Command;
 
 #[test]
 fn fails_when_in_wrong_dir() {
@@ -137,31 +136,6 @@ fn get_hint_for_single_test() {
         .stdout("Hello!\n");
 }
 
-#[test]
-fn all_exercises_require_confirmation() {
-    for exercise in glob("exercises/**/*.rs").unwrap() {
-        let path = exercise.unwrap();
-        if path.file_name().unwrap() == "mod.rs" {
-            continue;
-        }
-        let source = {
-            let mut file = File::open(&path).unwrap();
-            let mut s = String::new();
-            file.read_to_string(&mut s).unwrap();
-            s
-        };
-        source
-            .matches("// I AM NOT DONE")
-            .next()
-            .unwrap_or_else(|| {
-                panic!(
-                    "There should be an `I AM NOT DONE` annotation in {:?}",
-                    path
-                )
-            });
-    }
-}
-
 #[test]
 fn run_compile_exercise_does_not_prompt() {
     Command::cargo_bin("rustlings")