chore: Move everything into package/ (#1745)

* Move everything into package

* Remove .DS_Store

* Move scripts and eslintrc to package

* Create CODE_OF_CONDUCT.md

* fix some links

* Update all links (I think)

* Update generated docs

* Update notice-yarn-changes.yml

* Update validate-android.yml

* Update validate-cpp.yml

* Delete notice-yarn-changes.yml

* Update validate-cpp.yml

* Update validate-cpp.yml

* Update validate-js.yml

* Update validate-cpp.yml

* Update validate-cpp.yml

* wrong c++ style

* Revert "wrong c++ style"

This reverts commit 55a3575589c6f13f8b05134d83384f55e0601ab2.

package/ios/React Utils/Callback.swift

@@ -0,0 +1,49 @@
+//
+//  Callback.swift
+//  VisionCamera
+//
+//  Created by Marc Rousavy on 07.06.21.
+//  Copyright © 2021 mrousavy. All rights reserved.
+//
+
+import Foundation
+
+/**
+ Represents a callback to JavaScript. Syntax is the same as with Promise.
+ */
+class Callback {
+  private var hasCalled = false
+  private let callback: RCTResponseSenderBlock
+
+  init(_ callback: @escaping RCTResponseSenderBlock) {
+    self.callback = callback
+  }
+
+  func reject(error: CameraError, cause: NSError?) {
+    guard !hasCalled else { return }
+
+    callback([NSNull(), makeReactError(error, cause: cause)])
+    hasCalled = true
+  }
+
+  func reject(error: CameraError) {
+    guard !hasCalled else { return }
+
+    reject(error: error, cause: nil)
+    hasCalled = true
+  }
+
+  func resolve(_ value: Any) {
+    guard !hasCalled else { return }
+
+    callback([value, NSNull()])
+    hasCalled = true
+  }
+
+  func resolve() {
+    guard !hasCalled else { return }
+
+    resolve(NSNull())
+    hasCalled = true
+  }
+}