Walkthrough player features

• Editing the description in the extension/app
• Start- and end-screen
• Embed walkthrough player into third party websites
• Open Source CMS plugin Walkthrough players
• Browser plugin Walkthrough players
• Error message for bad selectors
• Commenting on steps
• Changing the selectors in the player
• Activity detection for step transition (for all transitions)
• Securing progression
• Adding steps from inside the app/extension
• Adding assertions from inside the app/extension
• Step description reuse
• Change the base url for the tutorial
• Run somewhere else
• Default run somewhere else
• Pre-requisites and post-requisites
• Record from history
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