New features to implement

[ahasverus]

Here is a list of features to add:

1. Generic functions

• get_phylopic_image(): Download a PhyloPic silhouette using the PhyloPic API 2.x.x
• get_world_basemap(): Download the IPBES world basemap available at https://zenodo.org/record/3928281
• format_authors_names(): Collapse a Vector of Author Names
• shorten_authors_names(): Shorten Full Names (Doe, John becomes Doe, J)
• remove_latex_tags(): Translate LaTeX tags in UTF-8
• remove_multi_spaces(): Remove Extra Space in Strings
• get_osm_coords(): Client to the OpenStreetMap Data Search Engine API (http://nominatim.openstreetmap.org)
• is_valid_doi(): Check if a DOI has a good structure
• check_doi(): Check if a DOI exists on the Web

2. Check arguments

• is_character(): check if an argument exists, is a character, and of length of exactly 1
• is_characters(): check if an argument exists, is a character, and of length > 0
• is_logical(): check if an argument exists, is a logical, and of length of exactly 1
• is_logicals(): check if an argument exists, is a logical, and of length > 0
• is_numeric(): check if an argument exists, is a numeric, and of length of exactly 1
• is_numerics(): check if an argument exists, is a numeric, and of length > 0