Support image references with fragment

[thendarion]

Actual Behavior

if an MD file has a # styled image, the HTML transformations fail completely, the PDF continues but there's no image

![my-image](my-image.png#bordered)

Copy of the error message, log file or stack trace

HTML

Error: java.lang.IllegalArgumentException: URI has a fragment component

PDF

[ERROR] Image not found. URI: file:/my-image.png#bordered.

Environment

• DITA-OT version: 3.5.1
• Transformation type:
  html5, xhtml, pdf