TYPO3 Core

Problem:
the section links in the TYPO3 Inline User Manual only reload the page instead of opening the wanted help section.
something similar happens when opening the inline help in tceforms: the link "see full description of table" leads only the the overview (TYPO3 Inline User Manual) with the not working links.
Reason for this is the url sanitizing in view_help.php (line 151) which see the asterisk as forbidden character and so it unsets tfID. the urls normally look like this: typo3/view_help.php?tfID=_MOD_user_setup.*

Solution:
add the asterisk to the regex or use the api function t3lib_div::sanitizeBackendUrl()

Since the security fix in view_help.php was applied to all supported branches this fix has to be applied to all branches, too.

(issue imported from #M12467)