Blender Git Loki

Sequencer: Scene Strip Performance

- Merged SEQ_OFSDRAW with V3D_OFSDRAW and define in the
DNA_view3d_types: Due to this FSAA always kicked in making the
rendering slow.
- Removed `Texture Solid` and `DOF`.
- Now when chosing Solid rendering the settings
of the original scene is used.
- Added a global override to use scene specific shading. In the
Future we will need to enhanced this so user can change the
settings.
- Added support for LookDev. LookDev crashed as it needed the
`evil_C` what was not set
- LookDev mode will always show the scene + world lights.

Reviewed By: brecht, fclem

Maniphest Tasks: T62517

Differential Revision: https://developer.blender.org/D4738