XML prettification changes content of XML tags

[muenzpraeger]

When the line width of a file is reached the plugin prettifies the XML as it would prettify for example HTML. But with XML it can actually lead to not only changed formatting, but also changed content.

For example we ran here into the issue that the plugin added line breaks to a boolean, which is invalid.

[pozil]

Kind of related to Issue #24

[kddnewton]

It no longer changes the content of tags, since #39