Parameters:
- uniqueID
- integer: id for editor, must be unique per page
- width
- integer|string: percentage (as string, e.g. "100%" or integer size in pixels), null for no change (full width)
- height
- integer|string: percentage (as string, e.g. "100%" or integer size in pixels), null for no change (~10 lines)
- lineNumbers
- boolean: true to display line numbers
- theme
- string: name of theme (which must be loaded via css)
- readOnly
- boolean: true if editing should be disabled
- mode
- string: language for highlighting (which must be loaded via js)
- initialCode
- string: initial code to place in editor