Lint detector for ColorStateLists that use app:alpha without android:alpha

Detection + quick fix + a new module for showing all available
AppCompat Lint rules

Bug: 146350188
Test: ./gradlew :lint-demos:lint-demo-appcompat:lint
Change-Id: I5def996beebe4d9f054044957eb4aaf1f7eb489e
diff --git a/build.gradle b/build.gradle
index e814436..30df614 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2017 The Android Open Source Project
+ * Copyright (C) 2019 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.