Refactor InlinePreview and -Editor into components.

This greatly simplifies the Inline component, delegating the actual
preview showing and code editing to other classes.  More over the
InlineExamples controller no more deals with the iframe and many
other details directly.

Removed CSS-loading from both iframe files - for now it's not used.
Also removed error alert - writing the error message to document.body
should be enough, plus it's less obtrusive.

Inside touchIframe.html wrapping the code inside Ext.setup().
For start it will make most examples work.