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detail: disable shape specialization by default for the moment
        as it currently seems to have navigation problems compared to
        the unspecialized case.

detail: allow to xray geometry only to certain level by using the --tolevel comm        and line argument; put a limit and crosscheck on the image size

detail: an alternative implementation for the Torus
        was added ( Torus2 ) which is based on the ROOT implementation;
        this is somewhat more numerically stable but does not have the
        multi-track vectorization feature as the original torus implementation

detail: bug fixing + code reduction + style formatting in UnplacedPolyhedron Capacity function
        properly handling input arguments to TriangleArea etc as const
todo:   revise functions TriangleArea etc... they should live somewhere else

[VECGEOM-138] Revise unit test for Polycone, fix for SurfaceArea and GetPointOnSurface() for VecGeomPolycone

Validation tests are dependent on ROOT being enabled to function,
since they depend on BenchmarkShapeFromROOTFile binary. This commit
makes them run only when ROOT is enabled and adds a configuration
option to turn them on/off.

Some files only have actual code to compile in certain builds.
This removes empty files from the compilation, so that no warnings
are emmited by the compiler.

Redo changes from commits 97dbc545 and
9842c5c9 that silence compiler warnings
by Clang, but without breaking the CUDA build.

Fix typo in Clang compiler option, and change CUDA defaults so that
USolids is disabled.

This reverts commit 9842c5c9 as it brakes
CUDA compilation.

This reverts commit 97dbc545 as
it breaks CUDA compilation

Some functions marked as override in previous commit actually depend on
USolids, so add compile guards so that they are only compiled when
USolids is enabled.