VOID AR v1.0 Beta4

[Key Updates]
1. Upgrades of VOID SLAM
- Loop-closure is added to VOID SLAM for fast relocating and better accuracy of locating and tracking, greatly improved user experience.
2. New feature:Environment Illumination
- With Environment Illumination, realistic reflections can be added to virtual contents to achieve more immersive AR experience.
[New]
3. Added flash light control
- This allows users to choose whether switch on the flash light or not during AR recognition.
4. Added audio recording to AR Recording
- AR screen recording will now sync record audio.
5. New API
- Add an API for developers to access Android permissions.
6. New feature: Pre-Process
- Pre-Process local imagetargets to binary files for a reduction of loading time.
[Improved]
7. Upgrades of ImageTarget Extension Tracking
- The stability of tracking is improved for a better user experience.
8. Upgrades of Image Target
- The algorithm of Image Target is improved for better recognition and tracking.
9. Improvements of error messages
- Some of the error messages are modified for better understood.
10. Support Unity3D version up to 2019.2.0
11. Support Android ARM64
12. iOS support Metal