improve scale/alpha/color behavoirs

[asd4486]

• Improve scale, can set a staticScale at initialization and control with scale(see new bubbles exemple)
• improve alpha, can set staticAlpha at initialization and control with alpha(see new bubbles exemple)
• improve static color, can set multiple staticColor at initialization (see confetti exemple)
• add confetti exemple
• improve bubbles exemple

TODO:

• color blend
• better rotation control(now the rotation of shape and particle are mix together)
• seperate scale x and y?
• ......

[andrewstart]

I am aware of this, and will take a closer look once I am less busy in a week or two. In the meantime, there are some places where spaces got replaced with tabs - could you change those back?

[asd4486]

I'll check on that

[asd4486]

If you have more feature ideas you could list in this PR, I'll may make it later :)