v0.5

This is the first release for macOS 🎉 This is still very experimental.

Changelog:

• Add macOS release
• Add match whole word to Quick Find
• Add basic auto-completion
• Reorder Help menu
• Removed unused placeholders in Preferences Dialog
• Fix AppImage on RHEL8
• Fix regex case match
• Fix regex search range
• Fix version information on Linux

Full Changelog: v0.4.9...v0.5