0.4

New Features:
- config: add support for parsing service.TimeoutStartSec
- service: add support for service "notify"-type startup

Fixes:
- parse: correctly set default type and restart mode
- parse_test: Add default cases to tests
- manager: fix masking services to disable them

Other:
- docs/superd.service.5: update to include recent changes to Type and Restart defaults
- internal/cmd/test: simplify testing with exec