[IMP] components: add hooks mechanism

part of #194

src/router/Link.ts

@@ -4,7 +4,7 @@ import { Destination, RouterEnv } from "./Router";
 
 type Props = Destination;
 
-export class Link<Env extends RouterEnv> extends Component<Env, Props, {}> {
+export class Link<Env extends RouterEnv> extends Component<Env, Props> {
   static template = xml`
     <a  t-att-class="{'router-link-active': isActive }"
         t-att-href="href"

src/router/RouteComponent.ts

@@ -1,7 +1,7 @@
 import { Component } from "../component/component";
 import { xml } from "../tags";
 
-export class RouteComponent extends Component<any, {}, {}> {
+export class RouteComponent extends Component<any, {}> {
   static template = xml`
     <t>
         <t