Add HUD Hooks

[VanirDev]

Adds HUD Hooks, a small API plugin that lets mods take over parts of the HUD the Mod API does not expose.

• Repo: https://github.com/VanirDev/se-plugin-hudhooks (public, MIT)
• Commit: 8d912fe20ccecf3105ca70fac591763330bd75da
• Runtime: net48, no NuGet dependencies beyond Harmony
• Source directory: HudHooks

What it does: a mod sends a mod message (id 2735914000, payload MyTuple<string, bool, bool> as (token, open, interceptEscape)) to claim a token while its own HUD screen is open, and releases it on close. While any token is held the in-world crosshair is not drawn. Tokens that ask for it also swallow ESC, so the pause menu does not open over the mod's screen. Tokens are tracked per screen so several mods can hold hooks at once, and state is cleared on OnSessionReady.

Patches: two prefixes.

• MyHudCrosshair.Draw returns false while a token is held.
• MyGuiSandbox.AddScreen drops the main menu screen when the menu was opened by a new ESC press or the MAIN_MENU control while an intercept token is held, and pops the pause the constructor pushed in single player. It returns true in every other case, so the patch is a no-op unless a mod is actively holding a token.

Failsafe: two ESC presses within 500 ms always let the menu through, so a mod that fails to release its token cannot lock a player out.

Compatibility: client-side only, no world or network state, safe on any server.