[rmodels] New feature idea: Animation speed

[TokyoSU]

Please, before submitting a new issue verify and check:

• I tested it on latest raylib version from master branch
• I checked there is no similar issue already reported
• I checked the documentation on the wiki
• My code has no errors or misuse of raylib

Issue description

Being able to use an animation speed possibly 0-1 float that slow or speed down animation regardless of the frame count.

Environment

All.

Issue Screenshot

None

Code Example

UpdateModelAnimation(model, anim[0], frame); <- frame should be float 0-1, in case it's 0.5f, it should be in the middle of animation.
With this, we could also use deltaTime.

Currently, we need to use frame in integer:

if (frame >= frameEnd)
    frame = 0;
frame++;

[CodingMadness]

absolutely, this should be in it.

[raysan5]

Thanks for reporting, added reference to #4426. I'm closing this issue.