Allow Textures to be created outside of a Project

[SnaveSutit]

Animated Java needs to create a texture that isn't related to any specific project, however, the Texture constructor includes this line:

Project.materials[this.uuid] = mat;

which causes an Error if Project isn't a ModelProject if I attempt to make the Texture before a Project has actually been loaded.

My PR is very simple:

if (!data.standalone) {
  if (!Project) throw new Error('Attempted to create a Texture without a Project. If this is intentional, set the standalone option to true.');
  Project.materials[this.uuid] = mat;
};

Add an option to TextureOptions to avoid adding to a project, while still throwing an error otherwise, but using that Error to intentionally inform the plugin developer.

My current work-around solution is this extremely hacky bit of code:

const OLD_PROJECT = Project
// @ts-ignore
Project = { materials: {} }
export const TRANSPARENT_TEXTURE = new Texture(
{
  id: `${PACKAGE.name}:transparent_texture`,
    name: 'Transparent',
  },
  '797174ae-5c58-4a83-a630-eefd51007c80'
)
Project = OLD_PROJECT

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[SnaveSutit]

Closed due to discussion with Jannis on Discord