Demo Plugins + Scripts Real Fluid

Minor updates, new features and partial optimization.

1. Add the fade-out function to make the liquid have a transition when it disappears.

2. The value of "Max Scale Time Percent" can be adjusted to be smaller.

According to the feedback and suggestions of some supporters, I made this update.

1. The range of velocity slider of fluid is adjusted and extended to a larger range.
2. Added an event to clarify the existing particles.

3. Now the particle size can change with the life cycle of fluid particles, and you can set the starting and ending sizes of particles. You can also simply adjust the transition curve(Adjust with the Max Scale Time Percent slider.). This greatly improves the expressive force and freedom of the fluid.See the video for details.