re-implement the gif conversion function with the correct approach.
The input data is not reusable as it undergoes modifications during parsing.
To address this, the function now creates a backup of the original data for use in GIF conversion.
This also resolves issues where the GIF viewport was incorrectly matched.
This implementation may be revisited upon
the availability of Animation::duplicate().
The Animation::frame() method has been modified.
It will now return InsufficientCondition,
if the frame value is the same as the previous one.
In addition to this change, we have also updated its usage accordingly.
replace the frame count unit from the int32_t to float
since animations could smoothly interpolate key-frames.
This notificably improve the animation smoothness in Lottie
Beta API changes:
Result Animation::frame(uint32_t no) -> Result Animation::frame(float no)
uint32_t Animation::curFrame() const -> float Animation::curFrame() const
uint32_t Animation::totalFrame() const -> float Animation::totalFrame() const
