Implement RFC 11: Redesigning Wasmtime's APIs (#2897)

Implement Wasmtime's new API as designed by RFC 11. This is quite a large commit which has had lots of discussion externally, so for more information it's best to read the RFC thread and the PR thread.

examples/interrupt.rs

@@ -10,13 +10,13 @@ fn main() -> Result<()> {
     // Enable interruptable code via `Config` and then create an interrupt
     // handle which we'll use later to interrupt running code.
     let engine = Engine::new(Config::new().interruptable(true))?;
-    let store = Store::new(&engine);
+    let mut store = Store::new(&engine, ());
     let interrupt_handle = store.interrupt_handle()?;
 
     // Compile and instantiate a small example with an infinite loop.
     let module = Module::from_file(&engine, "examples/interrupt.wat")?;
-    let instance = Instance::new(&store, &module, &[])?;
-    let run = instance.get_typed_func::<(), ()>("run")?;
+    let instance = Instance::new(&mut store, &module, &[])?;
+    let run = instance.get_typed_func::<(), (), _>(&mut store, "run")?;
 
     // Spin up a thread to send us an interrupt in a second
     std::thread::spawn(move || {
@@ -26,7 +26,7 @@ fn main() -> Result<()> {
     });
 
     println!("Entering infinite loop ...");
-    let trap = run.call(()).unwrap_err();
+    let trap = run.call(&mut store, ()).unwrap_err();
 
     println!("trap received...");
     assert!(trap.to_string().contains("wasm trap: interrupt"));