v0.6.0-CRAN - Remove {parsermd} dependency, deal with flat files

fusen 0.6.0

Breaking changes

• {fusen} now relies on {lightparser} instead of {parsermd} to parse flat file. This allows to avoid installation problems with {parsermd}, which is not updated anymore. As {lightparser} is lighter, this may have unattended effects on specific flat file cases. Please report any issue you may encounter. (#233)
• inflate_all*() does not use parameter clean anymore. Use check_unregistered instead to check if all files are registered in the configuration file.

New features

• draw_package_structure() along with get_package_structure() allows to draw the package structure with
  all functions created in each R file, and whether they are exported (#189)
• rename_flat_file() allows to rename a flat file, and deals with config and inflated files
• deprecate_flat_file() helps properly deprecate a flat file, modifies the config file
  and cleans the previously inflated files
• inflate() detects functions renamed or removed and allow to clean the package repository (#24)
• Allow organisation in init_share_on_github() to send to a GitHub organisation
• Fix load_flat_functions() to work with VSCode