Description
Set a single or multiple options. It may happen that you have to reinitialize the Image_Text  object after changing options.
Possible options to set are:  
      'x'                 | This sets the top left coordinates (using x/y) or the center point
      'y'                 | coordinates (using cx/cy) for your text box. The values from
      'cx'                | cx/cy will overwrite x/y.
      'cy'                |
      'canvas'            | You can set different values as a canvas:
                          |   - A gd image resource.
                          |   - An array with 'width' and 'height'.
                          |   - Nothing (the canvas will be measured after the real text size).
      'antialias'         | This is usually true. Set it to false to switch antialiasing off.
      'width'             | The width and height for your text box.
      'height'            |
      'halign'            | Alignment of your text inside the textbox. Use alignmnet constants to define
      'valign'            | vertical and horizontal alignment.
      'angle'             | The angle to rotate your text box.
      'color'             | An array of color values. Colors will be rotated in the mode you choose (linewise
                          | or paragraphwise). Can be in the following formats:
                          |   - String representing HTML style hex couples (+ unusual alpha couple in the first place, optional).
                          |   - Array of int values using 'r', 'g', 'b' and optionally 'a' as keys.
      'color_mode'        | The color rotation mode for your color sets. Does only apply if you
                          | defined multiple colors. Use 'line' or 'paragraph'.
      'font_path'         | Location of the font to use.
      'font_file'         |
      'font_size'         | The font size to render text in (will be overwriten, if you use automeasurize).
      'line_spacing'      | Measure for the line spacing to use. Default is 0.5.
      'min_font_size'     | Automeasurize settings. Try to keep this area as small as possible to get better
      'max_font_size'     | performance.
      'image_type'        | The type of image (use image type constants). Is default set to PNG.
      'dest_file'         | The destination to (optionally) save your file.