Fix pipeline syntax snippet generation (#198)

[strangelookingnerd]

Fixes #198

The deprecated color field was missing its getter and caused the snippet generation to fail.
The getter was restored and maps to the new style field - similar to the setter.

While at it I also moved the deprecated pipeline steps to the "Advanced / Deprecated" section and added a help text to make users aware of the deprecation and replacement steps.

Testing done

Manually checked that all pipeline steps generate as expected.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[mPokornyETM]

LGTM

[strangelookingnerd]

I’ll cut a release later today.