Extensions to evaluate

[fbaeuerlein]

• https://marketplace.visualstudio.com/items?itemName=aaron-bond.better-comments
  - https://marketplace.visualstudio.com/items?itemName=eamodio.gitlens
  - https://marketplace.visualstudio.com/items?itemName=mhutchie.git-graph
• https://marketplace.visualstudio.com/items?itemName=softwareape.numbermonger
• https://marketplace.visualstudio.com/items?itemName=emilast.LogFileHighlighter
• https://marketplace.visualstudio.com/items?itemName=Shan.code-settings-sync
• https://marketplace.visualstudio.com/items?itemName=vscode-ext.sync-rsync
  - https://marketplace.visualstudio.com/items?itemName=lkytal.pomodoro

mscgen:
- https://marketplace.visualstudio.com/items?itemName=arichika.previewseqdiag-vscode
- https://marketplace.visualstudio.com/items?itemName=mscgenjs.vscode-mscgen

plantuml:
- https://marketplace.visualstudio.com/items?itemName=jebbs.plantuml (included with 485ba3a)