* contrib/hbtip/utils.c
* contrib/hbtip/hbtip.hbx
+ Applied update from Lorenzo:
- removed text/plain logic in magic search since this breaks css and js mimes
- removed magic check for pkzip (today many formats like ooxml and odf are zips)
- added extension mime for css, js, ods, xlsx, zip
- added TIP_JSONSPECIALCHARS()
* Formatting, cleaned error calls, variables names and scopes (also in TIP_HTMLSPECIALCHARS())
* TIP_JSONSPECIALCHARS(), TIP_HTMLSPECIALCHARS(): Changed to not RTE
when empty string is passed. Empty string will return empty string.
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