Unsafe use of CDATA for geojson or json data encoding

[gschwind]

Description

ComplexInput._json_data encode geojson to json using CDATA, but it's unsafe since geojson may use "]]>" inside string or key and CDATA forbid this.

Environment

• operating system: all
• Python version: all
• PyWPS version: pywps-4.4
• source/distribution
• git clone
• Debian
• PyPI
• zip/tar.gz
• other (please specify):
• web server
• Apache/mod_wsgi
• CGI
• other (please specify):

Steps to Reproduce

Additional Information