Make use of filesystem concepts from the C++ library

[wolfram77]

Consider the following enhancements. Include any functions that have not previously been mentioned.

Non-member functions

• copy
• copy_file
• copy_symlink
• create_directory
• create_hard_link
• create_symlink
• current_path
• exists
• equivalent
• file_size
• hard_link_count
• last_write_time
• permissions
• read_symlink
• remove
• rename
• resize_file
• space
• status
• temp_directory_path

File types

• is_block_file
• is_character_file
• is_directory
• is_empty
• is_fifo
• is_other
• is_regular_file
• is_socket
• is_symlink
• status_known