Add option ``aligny`` to specify the vertical alignment of the text
with respect to the ``y`` offset from the top of the image. Possible
values of ``aligny`` are ``top`` (default), ``center``, and ``bottom``.
The height of the block of text is measured from the top of the first
line to the baseline of the last line.
- ``top``: (Current behaviour) The top of the first line of the block of
text is at an offset of ``y`` from the top of the image.
- ``center``: The vertical center of the block of text is at an offset of
``y`` from the top of the image.
- ``bottom``: The baseline of the last line of the text is at an offset
of ``y`` from the top of the image.
Resolves#13414
Add an "alignx" option to the images.Text to control whether the value of the "x" option is the left border of the text (current behaviour), the center of each line or the right border.
Fixes#10849
To sort an image's colors from darkest to lightest, you can then do:
```handlebars
{{ {{ $colorsByLuminance := sort $image.Colors "Luminance" }}
```
This uses the formula defined here: https://www.w3.org/TR/WCAG21/#dfn-relative-luminanceFixes#10450
