1.6.0

What's Changed

• Install NSIS in the CI installer job by @jamesabel in #94
• Update lock to pyship 0.7.5 by @jamesabel in #95
• Draw a thin theme-aware border around the viewer frame by @jamesabel in #96
• Add a theme preference: follow the OS setting, light, or dark by @jamesabel in #97
• Mirror the server's cursor shape on the client's local cursor by @jamesabel in #98
• Bump version to 1.6.0 by @jamesabel in #99

Full Changelog: v1.5.0...v1.6.0