Fix animation state bugs and restructure the engine - #1

1) [webkit] › e2e/animate.spec.ts:5:2 › animate › animates from initial to the animate target ──── Retry #1 ─────────────────────────────────────────────────────────────────────────────────────── Error: expect(received).toBeCloseTo(expected, precision) Expected: 1 Received: 0.021363 Expected precision: 1 Expected difference: < 0.05 Received difference: 0.978637 9 | // starts at the initial target rather than jumping to animate 10 | expect(await opacity(box)).toBeLessThan(1) > 11 | expect(Number(await settled(box))).toBeCloseTo(1, 1) | ^ 12 | }) 13 | 14 | test("initial={false} applies the animate target with no transition", async ({page}) => { at /home/runner/work/solid-motion/solid-motion/e2e/animate.spec.ts:11:38

1) [webkit] › e2e/animate.spec.ts:5:2 › animate › animates from initial to the animate target ──── Error: expect(received).toBeCloseTo(expected, precision) Expected: 1 Received: 0 Expected precision: 1 Expected difference: < 0.05 Received difference: 1 9 | // starts at the initial target rather than jumping to animate 10 | expect(await opacity(box)).toBeLessThan(1) > 11 | expect(Number(await settled(box))).toBeCloseTo(1, 1) | ^ 12 | }) 13 | 14 | test("initial={false} applies the animate target with no transition", async ({page}) => { at /home/runner/work/solid-motion/solid-motion/e2e/animate.spec.ts:11:38

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