graphics/zeno: Unbundle bullet, build with base clang, fix runtime crashesHEADmain

* Use bullet from devel/bullet instead of the bundled zenustech/bullet3
  fork. The fork was built as shared libraries (it forces
  BUILD_SHARED_LIBS=ON) that libzeno.so linked against but which were
  never installed, so libzeno.so failed at runtime with
  libBulletDynamics.so.3.17, libVHACD.so, libBussIK.so, ... not found.
  Only the parts devel/bullet does not provide (BulletInverseDynamics
  headers, BussIK, VHACD, URDFImporter) are still taken from the fork
  and compiled directly into libzeno.so. The single precision flavor
  is required (zeno assumes btScalar is float), so the build stops
  early when bullet-double is installed.

* Build with base clang instead of GCC. Mixing libstdc++ with Qt5 and
  the other dependencies built against libc++/libcxxrt crashed
  zenoedit in __dynamic_cast as soon as a node was added. The
  --allow-shlib-undefined -lomp workaround is no longer needed.
  Added a patch for the only clang build error (PrimUnmerge.cpp).

* Fix LIB_DEPENDS on math/Imath: depend on libImath.so instead of
  libImath-3_1.so, which no longer exists since Imath 3.2.

* Enable ZenoFX (wrangle nodes, without the CUDA part) and Alembic
  using graphics/alembic, which was already a dependency but unused.
  Added graphics/openexr to LIB_DEPENDS.

* Drop the openvdb, assimp, dem-bones-bin and libigl GH_TUPLEs, which
  were used only by disabled extensions (~73 MB fewer distfiles).

* Bump PORTREVISION.

PR:		299168

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