[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.

src/core/owl_event.ts

@@ -7,7 +7,7 @@ import { Component } from "../component/component";
  */
 
 export class OwlEvent<T> extends CustomEvent<T> {
-  originalComponent: Component<any, any>;
+  originalComponent: Component;
   constructor(component, eventType, options) {
     super(eventType, options);
     this.originalComponent = component;