against_glass concepts (for pony XL)

Initial version, needs more training and data setting.

Right now, it can do well breasts on glass, hand on glass, tongue on glass, lips on glass, ass on glass, pussy on glass, panties on glass

Next version should be better at anus on glass, stomach on glass, foot on glass, back on glass; this version can do those, but very inconsistently.

It's also pretty good at sitting, both for from behind and facing viewer.

Again, this is a first version, I should have a better one trained soon.