Signed-off-by: 程建超 <chengjianchao@jd.com>

Don't intercept onTouch event when flutter view is not attached.

修复同时点击两个按钮打开新页面时，导致返回时 flutter 点击事件处理故障的问题。

rm unnecessary params

# Conflicts:
#	example/lib/simple_page_widgets.dart
#	lib/container/container_coordinator.dart

flutter 页面 连续push的时候，后面的flutter页面的voice over焦点会丢失

fix android platform demo, add custom method channel demo, add integration.md

Update Frequently Asked Question.md

fix typo.

Harly fixed migrate 1.17

merge code

Fix type cast error with `invokeMethod` method.

The root cause is that dart only returned `Map<dynamic, dynamic>` rather than specific generic type when `invokeMethod` was called. For more specific generic type user can use `cast<String, dynamic>` after the result was returned.

merge code

Update format according for flutter's analysis option

add custom dartEntrypoint

# Conflicts:
#	example/lib/simple_page_widgets.dart

# Conflicts:
#	android/src/main/java/com/idlefish/flutterboost/containers/FlutterActivityAndFragmentDelegate.java

merge code