Quaero v0.19.0

What's Changed

• The empty workspace shows the mark and nothing else by @danielnuld in #410
• Structure and definition are sections, not a stack by @danielnuld in #411
• Drop the delimiters and parentheses the engine added by @danielnuld in #412
• Say when a connection has died instead of still calling it connected by @danielnuld in #413
• Reopening an object goes to its tab instead of stacking another by @danielnuld in #415
• chore(release): v0.19.0 by @danielnuld in #416

Full Changelog: v0.18.1...v0.19.0