--[BE Week] Remove ptex support

[jturner65]

Motivation and Context

PTEX Support is no longer desired in habitat-sim, so this support is being removed. This consists of removing cmake-driven flags intended to drive PTEX mesh handling, and PTEX-oriented classes and shaders from within the Simulator resource loading and rendering paths.

How Has This Been Tested

Current c++ and python tests pass

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes.
• All new and existing tests passed.

[jturner65]

Ticket : T156829184

[0mdc]

We'll want to either remove those PTEX enum entries, or treat/annotate them as errors:

• SupportedMeshType::PTEX_MESH (src/esp/assets/BaseMesh.h)
• DrawableType::PTexMesh (src/esp/gfx/Drawable.h)

[0mdc]

Nit: PTexMeshDrawable is still being referred to in some comments:

• src/esp/gfx/Drawable.h
• src/esp/scene/SceneGraph.h

[jturner65]

We'll want to either remove those PTEX enum entries, or treat/annotate them as errors:

* `SupportedMeshType::PTEX_MESH` (`src/esp/assets/BaseMesh.h`)

* `DrawableType::PTexMesh` (`src/esp/gfx/Drawable.h`)

Nit: PTexMeshDrawable is still being referred to in some comments:

* `src/esp/gfx/Drawable.h`

* `src/esp/scene/SceneGraph.h`

oops. missed those, thanks!

[0mdc]

LGTM!