Fix SceneKit Main Thread issue

[rocklyve]

The SceneKit produces an error, which maybe caused by a process, which normally should be executed in the Main thread

2019-04-26 15:22:19.929199+0200 App[16455:3339968] [DYMTLInitPlatform] platform initialization successful
2019-04-26 15:22:20.178335+0200 App[16455:3339924] Metal GPU Frame Capture Enabled
2019-04-26 15:22:20.178626+0200 App[16455:3339924] Metal API Validation Enabled
2019-04-26 15:22:20.373012+0200 App[16455:3339924] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
2019-04-26 15:22:20.373847+0200 App[16455:3339924] [MC] Reading from public effective user settings.
=================================================================
Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState]
PID: 16455, TID: 3339985, Thread name: com.apple.CoreMotion.MotionThread, Queue name: com.apple.root.default-qos.overcommit, QoS: 0
Backtrace:
4   libobjc.A.dylib                     0x000000021789f6f4 <redacted> + 56
5   CoreMotion                          0x000000021dfe9638 CoreMotion + 292408
6   CoreMotion                          0x000000021dfe9b68 CoreMotion + 293736
7   CoreMotion                          0x000000021dfe9a78 CoreMotion + 293496
8   CoreMotion                          0x000000021e0178a8 CoreMotion + 481448
9   CoreMotion                          0x000000021e0178ec CoreMotion + 481516
10  CoreFoundation                      0x000000021862b78c <redacted> + 28
11  CoreFoundation                      0x000000021862b074 <redacted> + 276
12  CoreFoundation                      0x0000000218626368 <redacted> + 2276
13  CoreFoundation                      0x0000000218625764 CFRunLoopRunSpecific + 452
14  CoreFoundation                      0x0000000218626498 CFRunLoopRun + 84
15  CoreMotion                          0x000000021e017280 CoreMotion + 479872
16  libsystem_pthread.dylib             0x00000002182a5920 <redacted> + 132
17  libsystem_pthread.dylib             0x00000002182a587c _pthread_start + 48
18  libsystem_pthread.dylib             0x00000002182addcc thread_start + 4
2019-04-26 15:22:20.459992+0200 App[16455:3339985] [reports] Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState]
PID: 16455, TID: 3339985, Thread name: com.apple.CoreMotion.MotionThread, Queue name: com.apple.root.default-qos.overcommit, QoS: 0
Backtrace:
4   libobjc.A.dylib                     0x000000021789f6f4 <redacted> + 56
5   CoreMotion                          0x000000021dfe9638 CoreMotion + 292408
6   CoreMotion                          0x000000021dfe9b68 CoreMotion + 293736
7   CoreMotion                          0x000000021dfe9a78 CoreMotion + 293496
8   CoreMotion                          0x000000021e0178a8 CoreMotion + 481448
9   CoreMotion                          0x000000021e0178ec CoreMotion + 481516
10  CoreFoundation                      0x000000021862b78c <redacted> + 28
11  CoreFoundation                      0x000000021862b074 <redacted> + 276
12  CoreFoundation                      0x0000000218626368 <redacted> + 2276
13  CoreFoundation                      0x0000000218625764 CFRunLoopRunSpecific + 452
14  CoreFoundation                      0x0000000218626498 CFRunLoopRun + 84
15  CoreMotion                          0x000000021e017280 CoreMotion + 479872
16  libsystem_pthread.dylib             0x00000002182a5920 <redacted> + 132
17  libsystem_pthread.dylib             0x00000002182a587c _pthread_start + 48
18  libsystem_pthread.dylib             0x00000002182addcc thread_start + 4

CoreMotion should produce this