Running the tabs default launch command (-t) does not respect redirects at the target.

$ node . -t https://aframe.io/a-painter

☝️ The above will error, even though the server will redirect to https://aframe.io/a-painter/ and serve HTML there:

$ curl -i https://aframe.io/a-painter
HTTP/1.1 301 Moved Permanently
Date: Mon, 03 Jun 2019 20:10:27 GMT
Content-Type: text/ht

‘QMutex::QMutex(QMutex::RecursionMode)’ is deprecated: Use QRecursiveMutex instead of a recursive QMutex [-Wdeprecated-declarations]

Related to #1190

VulkanGraphicsPlugin should destroy the VkDevice and VkInstance it owns on destruction rather than leaking them. This allows the Vulkan validation layers to detect resource leaks, which is useful for finding bugs both in hello_xr itself and in runtimes that use hello_xr with the validation layers as a smoke test for correctness.

XRTK - Mixed Reality Toolkit Feature Request

Is your feature request related to a problem? Please describe

The hand tracking implementation of XRTK already calculates curl strength for each finger and hand. Those values are not used for visualization yet though.

It would be nice to give the user a visual cue when grabbing stuff and curling fingers.

Relevant classes:

`HandJointVisualizer

The destructor hangs at pipe.stop().