[ENHANCEMENT]: Implement filters that OpenFL doesn't provide

[Cheemsandfriends]

There's about 3 filters in Adobe Animate that you cannot support due to OpenFL not having the following shaders implemented:

• BevelFilter
• GradientGlowFilter
• GradientBevelFilter

With some knowledge of GLSL and with the implementation of the dev branch, it would be possible, at least with the BevelFilter
altho with the Gradient ones, I don't really understand how would this work exactly
Maybe create a gradient bitmap and with that doing some shenanigans?
That would be the only way in theory