Custom Texture expression function

The call to the functions looks something like this:
texture("path/to/texture.png", $u, $v) where $u and $v
can be replaced by any other variable.

Signed-off-by: Marius Avram <marius.avram1309@gmail.com>
Oh yeah, I see. Very hacky ;)

Couldn't we use an InputEvaluator (or a different object with a similar purpose) to store the result of an evaluation?