Add support for mod credits in credit screen

[lamali292]

Add mod credits to the credits screen

Mods can now register their own sections on the in-game credits screen. A — MODS —
banner separates modded content from vanilla, each mod gets its own titled block, and
a fixed side-navigation list lets you jump straight to the top of the vanilla credits
or to any mod's section (mouse, keyboard, and controller).

Usage

Register at load time, using your mod id or any type from your assembly:

ModCredits.Register(ModId,
    new ModCredits.Section("TEAM",   ModCredits.Layout.Roles),
    new ModCredits.Section("HELP",   ModCredits.Layout.Roles),
    new ModCredits.Section("ART",    ModCredits.Layout.Names),
    new ModCredits.Section("LOC",    ModCredits.Layout.Roles),
    new ModCredits.Section("TESTER", ModCredits.Layout.Columns3));

Layouts

Layout	Description	.names format
Roles	Two columns, role beside name	Developer||Name 1\nArtist||Name 2
Names	Single column of names	Name 1\nName 2\nName 3
Columns3	Three columns of names, playtester-style	Name 1\nName 2\nName 3

Localization

All text is read from the vanilla credits loc table, namespaced by mod id
(<MODID>-<SECTION>.header / .names, plus <MODID>-<MODID>.title for the block title):

{
  "DOWNFALL-DOWNFALL.title": "Downfall",

  "DOWNFALL-TEAM.header": "Team",
  "DOWNFALL-TEAM.names": "Lead Developer||Name 1\nConcept & Balance||Name 2",

  "DOWNFALL-HELP.header": "Programming & Bug Fixes",
  "DOWNFALL-HELP.names": "Bug Fixes & Code Cleanup||Name 3\nBug Fixes||Name 4",

  "DOWNFALL-ART.header": "Art",
  "DOWNFALL-ART.names": "Name 5\nName 6",

  "DOWNFALL-LOC.header": "Localization",
  "DOWNFALL-LOC.names": "Language||Name 7\nLanguage||TODO\nLanguage||Name 8",

  "DOWNFALL-TESTER.header": "Playtester",
  "DOWNFALL-TESTER.names": "Name 9\nName 10\nName 11\nName 12\nName 13"
}

The section id (TEAM, HELP, …) is just the loc-key stub and is independent of the
visible .header text, so a single-person section can still read "Developer" or
"Author" on screen.

Demo

2026-07-27.12-56-22.mp4

[lamali292]

added nested sections

i.e as an example a localization section with a green header grouped together like in base game

   ModCredits.Register<DownfallMainFile>(
            new ModCredits.Section("TEAM", ModCredits.Layout.Roles),
            new ModCredits.Section("HELP", ModCredits.Layout.Roles),
            new ModCredits.Section("ART"),
            new ModCredits.Section("LOC", Children: [
                new ModCredits.Section("LOC_ZHS"),
                new ModCredits.Section("LOC_FRA"),
                new ModCredits.Section("LOC_ITA"),
                new ModCredits.Section("LOC_RUS"),
                new ModCredits.Section("LOC_KOR"),
                new ModCredits.Section("LOC_JPN"),
                new ModCredits.Section("LOC_PTB"),
                new ModCredits.Section("LOC_DEU")
            ])
            );