Ftw.htmlblock

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- Enlarge textarea for html-block content.
[raphael-s]

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- Introduce upgrade steps.
[raphael-s]

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- Remove metadata.xml-dependencie to ftw.simplelayout.
This package is an addon of ftw.simplelayout and should not install it.
[elioschmutz]

- Add suport for iframe tags on MS Edge
[raphael-s]

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- Prevent iframe from stopping event bubbling in IE
[Kevin Bieri]

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- Initial implementation. [mbaechtold]