Function registerColorTransform

registerColorTransform(): void
Registers the colour-transform batcher and the TintedSprite pipe with Pixi.

TintedSprite.ts calls this itself, at module scope, the moment anything imports it (directly, or transitively through AnimatedSprite/TileMap/DialogueStage, all built on it) - registration has to happen before the renderer is created, and an ES module's top-level code always runs before whatever imports it goes on to call new Game()/ Game.start(), so a game never has to know this pipe exists, let alone pass it through GameOptions.extensions itself. This stays exported, idempotent (registered guards a second call from double-adding it), and public for the rare case of a game building its own renderer setup outside Game.

Returns void
Example
```
import { registerColorTransform } from '@datamoc/mw_games/two-d/render';

// a game that assembles its own Pixi renderer extensions manually, instead of going
// through `Game`/`GameOptions.extensions`, registers the batcher itself before creating
// that renderer - importing `TintedSprite` (directly or transitively) already does this,
// so most games never call it
registerColorTransform();
```
- Defined in src/two-d/render/ColorTransformBatcher.ts:562