Add: LitMotion.Sequences

[yn01-dev]

Adds a sequence function that integrates multiple motions.

var x = 0f;
var y = 0f;

var handle = LSequence.Create()
    .Append(LMotion.Create(0f, 1f, 0.2f).Bind(v => x = v))
    .Append(LMotion.Create(0f, 1f, 0.2f).Bind(v => y = v))
    .Schedule();

The entry point for creating a sequence is LSequence.Create(), and the sequence is played with Schedule(). The return value is MotionHandle, just like a normal motion.

Also, LitMotion.Sequences is separated into a separate .asmdef file. Sequences are a powerful feature, but overusing them can lead to unnecessary complexity in your code, so I've made it so that you can add dependencies as needed.