Blender Git Loki

Cleanup: DRW: Remove uneeded _add suffix from DRW_shgroup_call_add

DRW: Refactor: Use DRWCall to accumulate per instance attributes

This is a big change that cleanup a lot of confusing code.
- The instancing/batching data buffer distribution in draw_instance_data.c.
- The selection & drawing code in draw_manager_exec.c
- Prety much every non-meshes object drawing (object_mode.c).

Most of the changes are just renaming but there still a chance a typo might
have sneek through.

The Batching/Instancing Shading groups are replace by DRWCallBuffers. This
is cleaner and conceptually more in line with what a DRWShadingGroup should
be.

There is still some little confusion in draw_common.c where some function
takes shgroup as input and some don't.

GPU: Add GPU_vertbuf_discard and GPU_BATCH_UNUSED

GPU_vertbuf_discard to clear buffer containers in place.
GPU_BATCH_UNUSED to tag batch that are cleared and not immediatly usable.

BLI_memblock: Add more options

- Use int instead of uint for safety and less conversions.
- Add free callback
- Add cleared alloc option

Cleanup: Remove DRWCallType

This simplify the rendering logic.

DRW: Fix threading hazard when rendering and using auto depth

Cleanup: DRW: Remove unused functions

DRW: Change Procedural function to use a GPUBatch

This is in order to have VAO handled by thoses batches instead of using a
common VAO. Even if the VAO has no importance in these case using a batch
will help when transitioning to Vulkan.

Eevee: Replace DRW_shgroup_empty_tri_batch_create by procedural calls

Mesh Batch Cache: Fix use of uninitialized variable

DRW: Make Instance count not a pointer

Goal is still to simplify the draw manager.

Cleanup: Eevee: Make planar downsampling not use instance drawing

Cleanup: DRW: Remove pointers to materials

GPU: Move Material index to nodetree evaluation

This removes the need to pass the Material* all over the place in the draw
manager. Cleanup comming right after.

DRW: Remove ModelViewMatrix and ModelViewMatrixInverse

GPU: Remove ModelViewMatrix and ModelViewMatrixInverse usage

Fix T64588: some new theme preferences not saving

Fix T64339: Crash with UV sculpt after undo

Keymap: add option for tilde key preference

Since the view menu is redundant for people with a numpad,
add a preference for it to switch between gizmos instead.

Preferences: file menu item to temporarily load factory settings

It's common to load factory settings as a test without wanting to
overwrite your own settings on exit.