Also added a bunch more point sets and input formats.
The radially averaged power spectrum is also output now.

Small utility for computing power spectra of pbrt's point sets.

Issue #87.

Having the embedding depend on the library used for compiling the CUDA
code down to PTX should be enough: according to CMake's documentation

> Additionally, if the target is an executable or library, a file-level
> dependency is created to cause the custom command to re-run whenever
> the target is recompiled.

However this was not happening, maybe due to it being an OBJECT library?
Or maybe some weird behaviour due to the modification timestamp on the
generated PTX file not being updated as the file gets re-generated.

This reverts commit 95b4c9b4.

Issue #37.

CUDA integration in Visual Studio seems broken as even if "Use Host
Preprocessor Definitions" is checked, the host preprocessor definitions
are still not used when compiling device code.

To work around that, define the macros using --define-macro to avoid
CMake identifying those as macros and using the proper (but broken) way
of specifying them.

Attempt to workaround gcc bug.

Issue #37.

In turn, this makes it possible to use -march=native, which gives about a 10% speedup on the CPU...

Issue #47.

Since we have a CMake target, we can do scoped include directories.
Remove duplicate compile flags, and also add compile definitions which
enables PBRT to compile on Windows for Pascal-architecture cards.

Compared to commit a685e020, this also

* changes the dependency to be directly on the library rather than some
  of its object file;
* adds a missing dependency on several generated header files;
* avoids passing `/D _CRT_SECURE_NO_WARNINGS` to nvcc;
* removes compiler flags that are part of the regular CUDA flags.

This reverts commit a685e020, which seems
to have caused issue #56 (the Ubuntu part at least.)

Require SM 5.3 and up (half floats...)
Print a more useful error when the GPU's shader model is insufficient.

Since we have a CMake target, we can do scoped include directories.
Remove duplicate compile flags, and also add compile definitions which
enables PBRT to compile on Windows for Pascal-architecture cards.

Fixes #27

Issue #27.

Related to issue #23.

Any file which is not part of a target will not show up in Visual
Studio, regardless of whether it is mentioned by a `source_group()` or
not.

Fixes via @wuyakuma in issue #20 (with some reformatting / minor changes.)