Blender Git Loki

Merge remote-tracking branch 'origin/master' into soc-2019-npr

# Conflicts:
# release/datafiles/locale
# release/scripts/addons
# release/scripts/addons_contrib

Clean up of lanpr_util stuff.

Merge branch 'master' into greasepencil-object

Merge branch 'master' into soc-2019-bevel-profiles

Progress on sampling the 2D coords along the curve's length. Sampling dysfunctional at the moment, debugging next. (Day 2)

Merge branch 'master' into soc-2019-outliner

Outliner: Active element

Initial implementation for active elements. Currently works for select and extend selection

Outliner: Add active element theme color

Adds a themable color for the outliner's active elements in both light and default themes

Linux: OpenXR Linking via OpenXR Loader

Calling OpenXR functions should now work on both Windows and Linux.

Also includes:
* Silence Linux only warnings
* Remove common_cmake_config.h and let CMake generate it when
configuring (contents vary on system it's compiled on)
* Remove JsonCpp CMake install target
* Remove unnecessary CMakeLists for JsonCpp includes
* Remove unnecessary CMake commands
* Style cleanup

Finished structure naming convention changes in lanpr_all.h

sort includes

Clang format the code.

cleanup SmallVector

Continue renaming structure variables.

Fixing LANPR structure naming to blender's style

Added new properties to operator / modifier and curve widget to UI. (Day 1)

Reduce wasted space in Function class

This is achieved by storing strings in a single buffer instead
of using `std::string`, which does small object optimization
for every string individually. This optimization can be done
because all strings are known when the function is build and
don't change later on.

implement == operator for StringRef

construct StringRefNull from pointer and length

Merge branch 'master' into functions