Search & watch histories + nullability - v0.2.1

• Add more nullability support to both front and backend
• Add logging to file & option to export all log files
• Add option to enable logs in release version
• Add fake loading bar to video previews
• Add minor desktop fixes
• Replace deprecated icons change dependency for android with original upstream version
• Improve logging colors
• Add search & watch history settings
• Add search history to search screen
• Print warnings on unexpected null elements

Full Changelog: v0.2.0...v0.2.1