Load all File core extensions.
Required files
facets/file/append.rb
facets/file/create.rb
facets/file/ext.rb
facets/file/null.rb
facets/file/read_binary.rb
facets/file/read_list.rb
facets/file/rewrite.rb
facets/file/rootname.rb
facets/file/sanitize.rb
facets/file/split_all.rb
facets/file/split_root.rb
facets/file/write.rb
facets/file/writelines.rb