Make FindBasisUniversal search libraries instead of pkgconfig

[Squareys]

Hi @mosra !

As promised, here's a version of the FindBasisUniversal that works with vcpkg.
I have a maybe unconventional use of find_package_handle_standard_args in there for setting the BasisUniversal_(Encoder|Transcoder_FOUND vars. It causes output when both are found and I'm interested in your judgment whether that is a good trade-off for the more concise code.

Best,
Jonathan

[mosra]

Sorry for not replying earlier.

[codecov-io]

Codecov Report

Merging #72 into master will increase coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage      91%   91.15%   +0.15%     
==========================================
  Files          53       53              
  Lines        4480     4025     -455     
==========================================
- Hits         4077     3669     -408     
+ Misses        403      356      -47

Impacted Files	Coverage Δ
...rc/MagnumPlugins/AssimpImporter/AssimpImporter.cpp	83.33% <0%> (-3.17%)	⬇️
src/Magnum/OpenDdl/Document.h	88.57% <0%> (-0.32%)	⬇️
...lugins/BasisImageConverter/BasisImageConverter.cpp	91% <0%> (-0.09%)	⬇️
src/MagnumPlugins/FreeTypeFont/FreeTypeFont.cpp	98.73% <0%> (-0.07%)	⬇️
src/Magnum/OpenDdl/Structure.h	96.49% <0%> (-0.07%)	⬇️
src/MagnumPlugins/DdsImporter/DdsImporter.cpp	77.95% <0%> (-0.04%)	⬇️
src/MagnumPlugins/OpenGexImporter/openGexSpec.hpp	100% <0%> (ø)	⬆️
.../MagnumPlugins/OpenGexImporter/OpenGexImporter.cpp	96.2% <0%> (+0.48%)	⬆️
...agnumPlugins/StanfordImporter/StanfordImporter.cpp	94.38% <0%> (+0.63%)	⬆️
src/Magnum/OpenDdl/Implementation/Parsers.cpp	88.13% <0%> (+0.66%)	⬆️
... and 17 more

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[mosra]

i feel like i'm repeating myself a bit too much 😅

[mosra]

All my local tests worked, so merged, thank you!