[+FEATURE] Support target type "text" to Escape View Helper
[+FEATURE] Support target type "text" to Escape View Helper

This adds the target type "text" to the Escape View Helper which comes
handy when you're trying to convert some HTML or XML input into plain
text. The implementation just uses PHP's strip_tags() method for the
conversion, more sophisticated implementations might follow when needed.

Change-Id: I2498bbf94044373c02fab9195170e7abf95a9dd2
Original-Commit-Hash: bc64d1e81cfa039659ed401da0f33ffb6ecda404

neos/fluid,neos/fluid