[big chore] restore core to monorepo (#287)

* move core into repo, apps into apps folder, update tests

* Update scripts for build:core

* improve scripts

* remove noise from www

* Update .gitignore

* Fix focus bug

* add ci test script

* Update main.yml

examples/tldraw-example/src/api-control.tsx

@@ -0,0 +1,64 @@
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+import * as React from 'react'
+import { ColorStyle, Tldraw, TDShapeType, TldrawApp } from '@tldraw/tldraw'
+
+export default function Imperative(): JSX.Element {
+  const rTldrawApp = React.useRef<TldrawApp>()
+
+  const handleMount = React.useCallback((app: TldrawApp) => {
+    rTldrawApp.current = app
+
+    app.createShapes(
+      {
+        id: 'rect1',
+        type: TDShapeType.Rectangle,
+        name: 'Rectangle',
+        childIndex: 1,
+        point: [0, 0],
+        size: [100, 100],
+      },
+      {
+        id: 'rect2',
+        name: 'Rectangle',
+        type: TDShapeType.Rectangle,
+        point: [200, 200],
+        size: [100, 100],
+      }
+    )
+  }, [])
+
+  React.useEffect(() => {
+    let i = 0
+    const interval = setInterval(() => {
+      const app = rTldrawApp.current!
+      const rect1 = app.getShape('rect1')
+
+      if (!rect1) {
+        app.createShapes({
+          id: 'rect1',
+          type: TDShapeType.Rectangle,
+          name: 'Rectangle',
+          childIndex: 1,
+          point: [0, 0],
+          size: [100, 100],
+        })
+        return
+      }
+
+      const color = i % 2 ? ColorStyle.Red : ColorStyle.Blue
+
+      app.patchShapes({
+        id: 'rect1',
+        style: {
+          ...rect1.style,
+          color,
+        },
+      })
+
+      i++
+    }, 1000)
+    return () => clearInterval(interval)
+  }, [])
+
+  return <Tldraw onMount={handleMount} />
+}