Jerboa v0.0.68-alpha Release

What's Changed

• Rename Activity nomenclature to Screen by @MV-GH in #1546
• Update the default instance list by @MV-GH in #1550
• Use AsyncPainter where possible by @MV-GH in #1543
• Hide Metadata outline when no metadata is shown by @MV-GH in #1548
• Increase fontsize votes slightly by @MV-GH in #1549
• Reduce recompositions due to TopAppBar by @MV-GH in #1542
• Fix Loading bar clipping behind content by @MV-GH in #1540
• Add blocks screen by @MV-GH in #1545

Full Changelog: 0.0.67...0.0.68