Build 0.8.17.40643 - Some new goodies and bunch of important bugfixes!

- Added detail albedo and normal map support to PBS Slice (both metallic/specular and transparent variants)
- Added log command to headless client, which switches the interactive shell to logging output until Enter is pressed again (based on feedback by @tehturk )
- Added usage info for headless commands (will be printed when using the help command or when using a command incorrectly) (based on feedback by @tehturk )


- Optimized session thumbnail management on the cloud - this should reduce server load and increase responsiveness
- Physical Locomotion (walk/run, zero-G etc.) now uses deadzone from settings (based on feedback by @ChiggenWingz )
- Optimized FindCharacterControllerFromUser and FindCharacterControllerFromSlot lookups
- Increased limit of Patreon names in the sky from 50 to 400
- Neos will now recognize m3u as multimedia and pass to libVLC (however there are still issues with streams not playing correctly)


- (hopefully) Fixed character parenter issue, causing player to become unparented when moving in their playspace (reported by @Bob , @Anomalous @DeliriousJax , @ohzee and others) - let me know if you still encounter it
- Fixed world crash when joining/loading a world with linked sync objects (this would often happen with avatar anchors present) (discovered in @Zane 's session)
- Fixed exception in FindCharacterControllerFromUser when the user root is missing