MathUtils: Added .inverseLerp(). (#21544)
MathUtils: Added .inverseLerp(). (#21544)

* MathUtils: Added .inverseLerp().

https://www.gamedev.net/tutorials/programming/general-and-gameplay-programming/inverse-lerp-a-super-useful-yet-often-overlooked-function-r5230/ for more information and to why its useful

* Update MathUtils.js

* Update MathUtils.js

Update variable names to match `lerp()`.

* Update MathUtils.js

Co-authored-by: Michael Herzog <f6aeef0c0610dd1547ce61332ac92e282a679af1@human-interactive.org>
gero3/three.js,donmccurdy/three.js,aardgoose/three.js,WestLangley/three.js,looeee/three.js,aardgoose/three.js,greggman/three.js,kaisalmen/three.js,06wj/three.js,looeee/three.js,jpweeks/three.js,fyoudine/three.js,greggman/three.js,Liuer/three.js,donmccurdy/three.js,jpweeks/three.js,mrdoob/three.js,makc/three.js.fork,kaisalmen/three.js,WestLangley/three.js,gero3/three.js,fyoudine/three.js,mrdoob/three.js,makc/three.js.fork,Liuer/three.js,06wj/three.js