Blender Git Loki

Initial implementation of code signing routines

This changes integrates code signing steps into a buildbot worker
process.

The configuration requires having a separate machine running with
a shared folder access between the signing machine and worker machine.

Actual signing is happening as a "POST-INSTALL" script run by CMake,
which allows to sign any binary which ends up in the final bundle.
Additionally, such way allows to avoid signing binaries in the build
folder.
Such complexity is needed on platforms which are using CPack to
generate final bundle: CPack runs INSTALL target into its own location,
so it is useless to run signing on a folder which is considered INSTALL
by the buildbot worker.

There is a signing script which can be used as a standalone tool,
making it possible to hook up signing for macOS's bundler.

There is a dummy Linux signer implementation, which can be activated
by returning True from mock_codesign in linux_code_signer.py.
Main purpose of this signer is to give an ability to develop the
scripts on Linux environment, without going to Windows VM.

The code is based on D6036 from Nathan Letwory.

Differential Revision: https://developer.blender.org/D6216

Change keymaps to use box select Include Handles by default

Also removes Ctrl+B and Ctrl+Alt+B (Ctrl+Q and Ctrl+Alt+Q in the
industry compatible keymap) which are now redundant in the keymap: they
used to toggle the Include Handlers option only.
We could instead use them to disable Include Handles, but lets first see
if there's much desire for it.

GPencil : Use different color for selected point sin Vertex Paint

GPencil: Show Vertex Opacity in Overlay for Vertex Paint

fix default node tree

remove other forces, they should be build using Particle functions

output vector from Perlin Noise node

support mapping input vsockets to multiple new sockets

Make box selection Include Handles option only act on visible handles

The option would previously act on invisible handles. Because of this,
it wouldn't be wise to enable it by default, even though it can be
tremendously useful (esp. with `Only Selected Keyframes Handles`
disabled).
This changes things based on animator feedback, so that we can enable
the option by default.

I can see that for some people even the old behavior of acting on
invisible handles could be useful, so we might consider bringing that
option back. `Include Handles` could then become an enum to chose the
behavior.

Merge remote-tracking branch 'origin/master' into sybren-usd

Merge branch 'master' into undo-experiments

Merge branch 'master' into tmp-task-foreach-pool

Merge branch 'master' into temp-graph-select-changes

new Custom Force and Perlin Noise node

Merge branch 'master' into functions

GPencil: Move move below color wheel in context menu

Overlay Engine: Armatures

GPencil: New operators for Vertex Paint

* Levels
* Invert
* Hue Saturation Value
* Bright/Contrast

GPencil: Show Edit points in Vertex Paint

Also added the option to hide edit points when disable Overlays in any mode.

GPencil: Remove Flip colors in Context menus