bump up version v0.15.16

sw_engine: improve drop shadow stabilization

Injected missing buffer swapping to
preserve non-direct drawing operations.

issue: #3814

wg_engine: fix shape aabb transfrom

Each shape has two types of bounding boxes: one from the original path and one from its transformed version.
If the transformation changed, the aabb wasn't updated, which resulted in effects being applied to the wrong area of he screen.
Now, if the transformation changes, the aabb is recalculated.

#3762

infra: --shutdown build warning on macos

bump up version v0.15.15

lottie: properly copy the colorstop data

previous logic only supported the shallow copy,
deep copy version is now implemented.

Revert "api: revise canvas behavior for improved flexibility and effi…

…ciency"

This reverts commit 08ea9a6.

revered due to a broken wgpe engine.

see: #3716

Revert "lottie: fix timeRemap frame boundary handling"

This reverts commit a566b59.

reverted by a regression

bump up version v0.15.14

wg_engine: Fixed typo in comment

Fixed spelling error from 'neccessary' to 'necessary' in two comment lines within the renderShape() and renderImage() methods.