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

exercises/14_generics/generics1.rs

@@ -6,8 +6,6 @@
 // Execute `rustlings hint generics1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 fn main() {
     let mut shopping_list: Vec<?> = Vec::new();
     shopping_list.push("milk");

exercises/14_generics/generics2.rs

@@ -6,8 +6,6 @@
 // Execute `rustlings hint generics2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 struct Wrapper {
     value: u32,
 }