Use external json lib and move files to app

[Meakk]

• Include an external json library (will be in the application in the long run)
• Move some files to the application
• Create a f3d_embed_file to replace vtk_encode_string

[codecov]

Codecov Report

Merging #255 (38e03b6) into master (8cb2fc5) will decrease coverage by 17.68%.
The diff coverage is 90.00%.

❗ Current head 38e03b6 differs from pull request most recent head 923402c. Consider uploading reports for the commit 923402c to get more accurate results

@@             Coverage Diff             @@
##           master     #255       +/-   ##
===========================================
- Coverage   88.03%   70.35%   -17.69%     
===========================================
  Files          89       91        +2     
  Lines        4372     6280     +1908     
===========================================
+ Hits         3849     4418      +569     
- Misses        523     1862     +1339     

Impacted Files	Coverage Δ
src/application/F3DStarter.h	100.00% <ø> (ø)
src/library/F3DOptions.h	100.00% <ø> (ø)
...ry/VTKExtensions/Readers/vtkF3DAlembicImporter.cxx	83.54% <ø> (ø)
src/library/json.hpp	29.88% <ø> (ø)
src/library/F3DOptions.cxx	96.99% <87.50%> (-0.59%)	⬇️
src/application/F3DStarter.cxx	86.59% <100.00%> (ø)
src/application/main.cxx	100.00% <100.00%> (ø)
src/library/f3d_window_impl_standard.cxx	98.43% <100.00%> (+0.01%)	⬆️
src/library/f3d_options.cxx	74.32% <0.00%> (-0.52%)	⬇️
src/library/f3d_log.h	100.00% <0.00%> (ø)
... and 8 more

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