For console output, indent consecutive lines based on first line's timestamp

Possibly somewhat more readable

Template-independent version is intentionally not given this feature
- Partially as a demonstation of customizability
- Partially as a hint that template-independent rendering exists
  only to provide a baseline of functionality, without intentions
  to be feature-complete
Add config option to disable templates
Add config option to use a custom template path
Optionally determine custom template path from command line arguments