Fix SpecFlow extension compatibility

[gasparnagy]

🤔 What's changed?

Made interfaces & classification names unique for the Reqnroll extension so that it does not conflict with other extensions, e.g. the SpecFlow extension.

⚡️ What's your motivation?

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

♻️ Anything particular you want feedback on?

📋 Checklist:

• I've changed the behaviour of the code
• Users should know about my change
  • I have added an entry to the "[vNext]" section of the CHANGELOG, linking to this pull request & included my GitHub handle to the release contributors list.

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[clrudolphi]

One speculative comment about the strings used within the DeveroomClassifications.cs file. Otherwise this all quite straightforward.