Blender Git Loki

Change panel class name to avoid conflicts

Add GPencil Layer to Scene UI panel

Remove unused parameters in UI panel for GP Object

The type of display is not used in GPencil object.

Merge branch 'blender2.8' into gpencil_2.8

Add a call to draw gpencil object for 2D

As the current drawing action is 2D, we need to call the function for drawing.

All previous strokes are drawn in 3D because they are converted after finish each stroke from 2d to 3d.

Fix error in transformation when object is rotated

Initialize rotation of GPencil Objects

Return datablock for GPencil

Cleanup code doing more compact if groups

Create an OB_GPENCIL object automatically if not selected a previous one

Modify creation of the object to remove unused RNA and define size in header file

Remove redundant lines

Avoid wrong activation of edit mode

Fix error to toggle to scene. Need more work to avoid conflicts among modes.

Fix error in parameter list

Apply diff_mat to transformations

Fix parameter list for interpolate functions

Apply diff_mat always and not only when layer parented. If the matrix is not necessary, a unit matrix is generated. This keeps the code cleaner and can handle scene and OB_GPENCIL objects

Show parent in properties panel

Basic parent to object modificaction. There are errors like double drawing and editing