Init and Destroy

• Tracking if the scene ran using 'hasRun' property
• Init is now called at first run instead of after adding to manager
• Destroy function in scenes, called at removing a scene that ran

Scene updates

• Stopping scenes
• Removing scenes
• Getting active scene name
• Retrieving a list of scene names
• Some code docs

Extending PIXI namespace

• Library now accessible from under the PIXI namespace to be consistent with other plugins
• Seperate build output for ESM to support usage as module

Working scenes

• Fixed deltatime in update
• Reworked build pipeline
• Rename to scenes
• Basic README with examples