Hit-test can hit more than 32 depth clipping actor.

Hit-test can hit more than 32 depth clipping actor.

When clipping mode is CLIP_TO_BOUNDING_BOX, the limitation of
clipping depth doesn't exist. We can clipping near 2^15-depth.
But current clipping algorithm only allow 31-depth of clipping.

This patch make that we don't use depthmask in hit-test algorithm
When clipping mode is enabled, and current actor hit test failed,
just skip all children's hit test.

Note : CLIP_CHILDREN is kind of rendering method, So when clipping mode is
CLIP_CHILDREN, we can't detect how it "really" clipped.
This is physically limitation, so just ignore it.

Change-Id: I83524d6f96ccbb59d7b2802f1630c7e338b251a0
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>