ps3: Add some mutex debug helpers
Add str_cleanup() helper
Add missing title and contents for network discovered services
Huge rework of prop tree symbolic links

Let's hope it doesn't break too much
Add so called 'managed services'

When such service is added by a sub system they appear in the
settings (so user can rename, enable/disable it, etc)
httpclient: Fix broken cookie domain validation

Fixes #1794
ps3: Add NTFS support