Changes in response to the rOpenSci peer review process.
The repository has been transferred to the rOpenSci organization.

MINOR IMPROVEMENTS

• Improved input validation for all functions
• Improved error messages
• New method format.c3d() and internal restructuring of printing for c3d objects
• Internal changes: Improved build process, automated cleaning of build artifacts, restructured source code

DOCUMENTATION FIXES

• Updated vignette: Added visualization examples,link to a video of the recording of the example data, minor fixes
• Added more context for the example data in vignette and function documentation
• Converted function documentation to markdown
• Improved function documentation in regard to the different point data formats
• Fix typos

BUG FIXES

• Fix bug in c3d_write(): Silently failed when writing directory was nonexistent
• Fix compiler and ubsan warnings in C++ source code