Cache: addBitmapData can auto-create FrameData, fixes 1294

- In the "Particle Class" demo there was no explicitly-created FrameData which cause issues later on.
  This cache updates ensures that FrameData will be automatically created for any added cached bitmap data, unless such is explicitly supplied or forbidden.
- Impact: low
  - AnimationManager.loadFrameData is called for all Sprites with BitmapData (except those with an explicit null FrameData) added to the cache
Merge pull request #1300 from pnstickne/wip-1294b

Cache: addBitmapData can auto-create FrameData, fixes 1294