Hotline API changes

Derived by comparing the public API surface across all 3 releases that carry one. A member listed under a version is callable from that version on.

A signature change still compiles for a caller that rebuilds against the new version, and still breaks one that ships against the old one.

1.3.0

Added

• Hud.IsPanelVisible(string)
• Hud.ShowOverlay(bool)
• Hud.ShowPanel(string, bool)

1.2.1

First release covered here. 40 public types and members.