[REL] v2.0.0-beta-8

v2.0.0-beta-8

Fixes

• portal: allow use of expression to describe portal target
• compiler: fix issue with identifiers with same name
• reactivity: fix memory leak
• app: validate props for root component in dev mode

Improvements

• component: display nice error for wrong child component
• props_validation: have clearer error messages
• component: only useState on props that are already reactive
• compiler: add better support for "in" and "new" operators in templates
• misc: export the validate function
• app: add setting to warn if no static props object
• add static App.registerTemplate and update Portal to use it
• add basic infrastructure to buid owl-runtime without compiler