ui transit: improve zoom effect smoothness by subpixel rendering.

ui transit: improve zoom effect smoothness by subpixel rendering.

Summary:
evas image might have a better quaility if scaling/transform is not necessary,
so we have a condition to check if image is axis-aligned transformed or not.

On the other hand sub-pixel(floating point coordinates unit) rendering necessary
if image has an effect such a zooming. This would result in a smoother effect
than integer coodinate system.

We need a more precise condition to confirm this,
so we intrduce "anti-alias" option to decide the condition.
now, anti-aliased objects will have a sub-pixel rendering always.

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D12194

Change-Id: Idfe94766d8721ba32392cad0f3d214c9080e33c9