Build fixes for v0.19 (#7128)

* Prevent libomp linking when libomp5-dev is installed, due to cmake adding the libc++ dir as a linker search path. In sycl mode, libiomp is the default OMP runtime.
Do not install clang to prevent libomp-dev being installed.
DEVELOPER_BUILD option for SYCL CI
ccache gz -> xz
Dockerfile for building docs.
Use cxx11 abi pytorch to allow building both torch and tf docs at once.
* Use glfw null platform auto selection
* Upgrade glew to v2.2
* Fix GLFW platform selection when re-initialized. GLFW remembers last null platform.
* macOS script typos

Convert triangle mesh model to tmesh map (#6758)

- ToString() for Material and string representation in Python.
- MaterialRecord to Material conversion - allows converting triangle mesh models to a map of tmeshes, including materials. Limitation: Only one material per tmesh (same as TriangleMeshModel)
- Support for emissive color reading in FileASSIMP (model) and writing for tmesh (tio FIleASSIMP)

Fix tensorboard examples with MonkeyModel path (#6569)

Fix two crash bugs on Apple Silicon (#6008)

* Remove -nocompact_unwind and suppress warnings instead
* Fix crash bug on Apple Silicon on closing gui window (might be Ventura-only)

Add new Mitsuba Python example + update CPU rendering docs (#5991)

* Add new material estimation example
* Update docs for CPU rendering for Ubuntu 22.04
Co-authored-by: Sameer Sheorey <sameer.sheorey@intel.com>

Build with libomp 11.1 and package it in the macOS wheel (#5679)

Fail build if newer libomp found
Install libomp 11.1.0 from old brew bottle for catalina (10.15)

make PaintUniformColor return by reference (#5566)

0.15.1 version bump (#4782)

0.15.0 version bump (#4778)

0.14.1 version bump (#4358)