This makes our createTexture* helpers more consistent with the
createMaterial helper, and extends the wrapped Engine class with new
methods.
Before, clients did something like this:
const ao = Filament.createTextureFromPng(Filament.assets['foo.png'], engine);
...
engine.destroyTexture(ao);
Now, they can do:
const ao = engine.createTextureFromPng('foo.png');
...
engine.destroyTexture(ao);
This is more symmetric and concise. In general the JS API now supports a
class of "buffer-like" objects which exploit dynamic typing in order to
accept any of the following: BufferDescriptor, asset string, or
Uint8Array.
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