Enhancement: Add pages regarding using blend modes and filters in Adobe Animate Texture Atlases

[biomseed]

With the recent v0.5.0 update, certain texture atlases now have gotten blend modes and filters working. I heard that these work fine in game when the atlases are exported, but Animate exports these things wrong, and that Cheems had information on how to fix these. I think this information should be added to the modding docs here or at least to flxanimate's README.md.