clean app module

* remove log-spam
* expose only players in pwp namespace
cleanup player module
static embed page

* add example for injected player data
* app module waits for metadata when deferred option is set to true
* moderator sends metadata when he gets “waiting” signal from embedded
page
* add waitForMetadata to embed module
Merge pull request #196 from podlove/moderator-send-metadata

Moderator send metadata