Implement __debugInfo()

[olivervogel]

Implement __debugInfo() on the following classes:

• Intervention\Image\Image
• Intervention\Image\Origin
• Intervention\Image\EncodedImage
• Intervention\Image\Drivers\Gd\Frame
• Intervention\Image\Drivers\Imagick\Frame
• Intervention\Image\Geometry\Rectangle
• Intervention\Image\Colors\Rgb\Color
• Intervention\Image\Colors\Cmyk\Color
• Intervention\Image\Colors\Hsl\Color
• Intervention\Image\Colors\Hsv\Color

The result is more informative debug information when objects of the classes are output via var_dump().

For example the following code:

$color = ImageManager::gd()
    ->read($path)
    ->pickColor(0, 0);

var_dump($color);

results in:

object(Intervention\Image\Colors\Rgb\Color)#9 (4) {
  ["red"]=>
  int(104)
  ["green"]=>
  int(128)
  ["blue"]=>
  int(132)
  ["alpha"]=>
  int(255)
}