Blender Git Loki

GP: Add small offset to stroke over surface.

This small offset helps to keep the stroke over the surface and avoid the stoke is "inside" the face of the surface.

We could add this as a parameter in the UI, but after doing a lot of test, the valid values are very limited and don't worth the change, so a hardcoded value works fine.

Buildbot: Get rid of OpenJPEG 2 hack

Also clarified some options and decisions.

CMake: Automatically detect OpenJPEG 2 libraries

There is chance that on a system with both versions installed this
*might* cause some issues. Such system will be pain to support out
of the box anyway.

This change allows to use precompiled libraries without extra
modifications in the config.

3D View: option to always show center in face mode

This matches 2.7x behavior

3D View: use thicker edges when in edge-mode

Without this there is no visual differentiation between face/edge mode.

3D View: scale edit-mesh drawing by pixel size

Cleanup: inline icon conditional

UI: show workspace panel last & use a parent panel

UI: move workspace panels to tool settings

While this isn't the most logical place, there are very few workspace
options and they don't need to be in such a prominent location.

Transform: fix redundant gizmo constraint axis

Setting the constraint caused the redo to show
redundant XYZ constraints UI.

UI: use property split for mesh options

UI: add active tool panel to tool settings

MSVC: Set the warning C4189 from level 4 to level 3

This is a useful warning and there is an equivalent used in `GNUC` and `clang` compilers.

Reviewed on IRC by @brecht and @LazyDodo

Fix Freestyle build error after recent merge.

Correction to previous commit

Should not include ABI.

Buildbot: Tweak configuration to actually ve successful in chroot

Buildbot: Make configuration to pass config state

- Foe some reason CMake's platform and processor are not intialized there.

- Need to set variables in cache, otherwise they are not visible in the
actual CMake files.

Cleanup: add file doxy comments

Merge branch 'master' into blender2.8

Cleanup: indentation