### File Functions

#### readfile

Reads the file at path provided as argument, and returns its contents
as bytes.

#### readtextfile

Reads the file at path provided as argument, and returns its contents
as a string.

#### writefile

Accept a file path as the first argument, and content as a second argument
and writes content to the file at path. Any existing content is truncated.

Content can be either bytes or text.

#### opendir

Accept a path to a directory and opens it and returns an iterator that
can be used with foreach. Accepts a second boolean argument, if true
the directory will be walked recursively. Does not follow symbolic links.

Each item in the iteration is a dictionary that will contain the following keys.

path: Will contain the full path to the file
type: Will conain either the string "file", if the item is a file, "dir" if the
  item is a directory, "symlink" is the item is a symbolic link, or "error" if
  there was an error reading the items file entry.

#### getcurrentdir

Gets the current directory as a string.

#### takefilename

Gets the filename component of a path.

#### takedirectory

Gets the directory component of a path.

#### takeextension

Gets the extension component of a path.


#### dropextension

Gets the path with extension removed.

#### takebasename

Gets the name without extension and directory.

#### joinpaths

Accepts two path components and join them.

#### readfilehandle

Reads the specified number of bytes from the provided file handle. If there is
not enough data remaining to read, returns all the remaining data. So it
returns a bytes value of zero length on end of file, and can be used to detect
EOF.

#### writefilehandle

Accepts a file handle and a bytes value and writes it to the handle.

#### openfilehandle

Opens a file handle in one of the given modes "r", "w", "rw", "a".

#### gethandlesize

Returns the size of the associated file of the handle in 8 bit bytes.

#### renamefile

Renames a file to new name.

#### isfile

Checks if a path is a file.

#### isdirectory

Checks if a path is a directory.