Blender Git Loki

Merge branch 'master' into HMD_viewport

Conflicts:
source/blender/editors/gpencil/gpencil_paint.c

Moved opening and closing the HMD drivers to the HMD window creation to solve issues with Windows 10 for some devices.
This solves i.e the DK2/CV1 screen being accessible when opening a window for configuration (since the DK2 needs rotation).

Implemented new Vive distortion coefficient values based on approximated lenswrap

Move HMD operators to wm_hmd.c

Replace wm_device.c with wm_hmd.c, rename functions appropriately

Merge branch 'master' into HMD_viewport

Fix closing HMD window not exiting HMD session correctly

Fix virtual cursor not being removed correctly when stopping hmd session

Avoid view setup function prototypes, move them to top of file

Move drawing matrix setup into own function

Fix manipulator interaction not using correct projection matrix

Moved matrix setup for interaction into own util function now. Also did
cleanup in related code.

Force using HMD parameters instead of camera ones in camera perspective

Fix lens separation applied wrongly onto projection matrix

Fix projection matrices not taking focal length of HMD into account

Re calibrated the vertical position for the Vive lens distortion shader

Fix crash when closing HMD window during running session

Fix HMD view drawing black if device is set to 'None'

Cleanup: Naming, use util function

Remove unnecessary check

Avoids having to pass around window-manager

Fix Multi-view drawing interfering with HMD view drawing

Don't do any multi-view drawing in HMD view, it doesn't make any sense.