Escape some more values
Escape some more values

While they should not contain user-supplied input at all it's always good to sanitize more data in case somehow the API got misused by developers.

As discussed in https://github.com/owncloud/core/commit/1edd6d7d0b15a3fd0ad7b20107ac0c603f63204c#commitcomment-9804349

c0d3z3r0/sabre-dav,kriswebdev/sabre-dav,TheTypoMaster/sabre-dav,fruux/sabre-dav,vmire/sabre-dav,PVince81/sabre-dav,fruux/sabre-dav,n-6/sabre-dav,TheTypoMaster/sabre-dav,PVince81/sabre-dav,vmire/sabre-dav,staabm/sabre-dav,readdle/sabre-dav,readdle/sabre-dav,n-6/sabre-dav,jeremydenoun/sabre-dav,TheTypoMaster/sabre-dav,PVince81/sabre-dav,macressler/sabre-dav,macressler/sabre-dav,fruux/sabre-dav,c0d3z3r0/sabre-dav,readdle/sabre-dav,staabm/sabre-dav,jeremydenoun/sabre-dav,jeremydenoun/sabre-dav,fkooman/sabre-dav,macressler/sabre-dav,staabm/sabre-dav,kriswebdev/sabre-dav,kriswebdev/sabre-dav,vmire/sabre-dav,fkooman/sabre-dav,n-6/sabre-dav,c0d3z3r0/sabre-dav,fkooman/sabre-dav