Reduced MsBuild log output and consistent use of [Reqnroll] prefix

[obligaron]

🤔 What's changed?

• Changed the default log level of reqnroll MsBuild messages to normal or low.
• Used [Reqnroll] prefix for all generated messages.
• Removed unused log related MSBuild configurations.
• Added an extra entry in the Troubleshooting section to highlight the additional logging option.

⚡️ What's your motivation?

When generating a project with many feature files, Reqnroll will generate many log entries even if minimal logging is configured.
However, the logging guidelines state that only high importance messages should be logged when minimal detail is specified.
The detailed output happens because we currently always set a `VerboseOutput' MSBuild property to true. This has been happening since commit 828da0d and is probably an unintentional change (verbose should not be enabled by default).

🏷️ What kind of change is this?

• 📖 Documentation (improvements without changing code)
• 🏦 Refactoring/debt/DX (improvement to code design, tooling, etc. without changing behaviour)

♻️ Anything particular you want feedback on?

📋 Checklist:

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• 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.

[gasparnagy]

This is cool. I will play with it a bit tomorrow and then merge.

[gasparnagy]

thx!