Add support for other interpolators

[pakoito]

RoadRunner/roadrunner/src/main/java/com/github/glomadrian/roadrunner/painter/indeterminate/TwoWayIndeterminatePainter.java

Line 77 in e3bbad7

movementAnimator.setInterpolator(new LinearInterpolator());

RoadRunner/roadrunner/src/main/java/com/github/glomadrian/roadrunner/painter/determinate/TwoWayDeterminatePainter.java

Line 64 in e3bbad7

movementAnimator.setInterpolator(new LinearInterpolator());

I'd like to replace them with my own interpolator choice when creating them programatically.