XWIKI-9803: repair CDATA containing square brackets

 * repair here is no longer necessary; fix moved to platform module

(cherry picked from commit b182b673be66c344ede8e52f58731423fd2c55c4)
XRENDERING-325: confluence parser: support for ac:structured-macro

 * same treatment as the ac:macro
 * adding simplified support for the ac:rich-text-body body, too

(cherry picked from commit ad0c3687c4c31605eea625db5398f94d2aecc501)