Merge branch 'blender2.8' into tmp-b28-motionpath-drawing

Cleanup: Remove old legacy immediate mode drawing code

This was not being used. At least from simple tests, all options seemed to be working ok

Cleanup: Fix compiler warning

Draw motionpaths with thicker lines by default - Now 2px thick

Copy object animviz settings when doing COW

It probably doesn't hurt to do an explicit copy here - it's done for pose too.
However, it still doesn't solve the problem of keyframe labels not showing up
at all on motionpaths from old files.

Fix: Motionpaths were not drawing for bones

As with the objects case earlier, the problem was that when doing COW for the
viewport, the pchan->mpath pointer was just getting set to NULL in the copying
code. It's unclear for now whether this will cause any problems down the track
somewhere else - the comment there was non-specific about why we were explicitly
not copying/keeping the old link.

Enable motion path overlay by default

Compile fix for previous commit: Forgot to reset these variables (were used when testing previous fix)

Fix: Motion path colors/frame indicator weren't updating on frame change

This should have been using DEG_get_ctime() to read time instead of CFRA.
In viewport code, Scene/Scene_Eval's current frame doesn't change ever.

Fix: The overlays option to turn motion paths on/off didn't work

Merge branch 'blender2.8' into tmp-b28-motionpath-drawing

# Conflicts:
# source/blender/draw/intern/DRW_render.h
# source/blender/draw/intern/draw_manager.c
# source/blender/draw/intern/draw_manager_data.c
# source/blender/makesdna/DNA_view3d_types.h
# source/blender/makesrna/intern/rna_space.c

COW Fix - Motion paths were not drawing as they weren't getting copied

Motion Path Update: Tag objects for copy on write flushing after calculating

Motion Paths: Port motion path to draw manager (1/2)

Add keyframe drawing by baking the keyframe position in the motion path vert
cache.

Only remaining problem is that toggling the pose bone MOTIONPATH_VIEW_KFACT
needs a motion path recalc now.

DRW: Disable depth test for text drawing.

Motion Paths: Port motion path to draw manager (1/2)

Keyframe drawing is still missing but other than that it's pretty much
on part with what we had in 2.7.

DRW: Add new drawcall type DRW_CALL_RANGE

Restore editors/space_view3d/drawanimviz.c as draw/intern/draw_anim_viz.c

This was removed from the codebase with the Blender Internal removal,
but before the drawing code had been added to the new drawing engines.

Add defines in Overlays popover for Motion Paths

WIP setting up draw manager stuff...