[IMP] types: make component generic types optional

In most cases, we just want Component<any, Env>. But since it was so
annoying to have always the type Env, we actually used
Component<any,any> everywhere.

With this commit, the generic types have a default (and their order is
swapped), so we can simply use Component in most cases, and
Component<Props> when we want to type the props.

tests/router/link.test.ts

@@ -31,7 +31,7 @@ describe("Link component", () => {
             </div>
         </templates>
     `);
-    class App extends Component<any, any> {
+    class App extends Component {
       static components = { Link: Link };
     }
 
@@ -65,7 +65,7 @@ describe("Link component", () => {
             </div>
         </templates>
     `);
-    class App extends Component<any, any> {
+    class App extends Component {
       static components = { Link: Link };
     }