* complain on missing entries in flutter.yaml

* change to a hard failure

* better parsing of adb devices output

* re-order lines

* fix analysis errors

* review comments; fix test

* re-add an export for debugPrint

Check the adb install output for errors and stop "flutter run" if package installation fails (#3672)

* rework flutter run

* fix npe with --debug-port

* connect to obs and exit when that conneciton closes

* update todos

* add a target for android-x64

* update armeabi-v7a to x86_64

Also, update hello_android to use the new Java class names.

Add a command that can capture a Skia picture of a Flutter frame and send it to a file or skiaserve debugger (#3165)

Support "flutter refresh" in the Gradle-based sample project

Well, all the easy ones, anyway.

For some reason `// ignore:` isn't working for me so I've disabled
lints that need that. Also disabled those that require a ton of work
(which I'm doing, but not in this PR, to keep it reviewable).

This adds:
- avoid_init_to_null
- library_names
- package_api_docs
- package_names
- package_prefixed_library_names
- prefer_is_not_empty
- sort_constructors_first
- sort_unnamed_constructors_first
- unnecessary_getters_setters

And fix a zillion omissions this uncovered.

After this patch, the flutter logs command on Android shows only log messages
since the command was run. Previously, it showed historical logs, which was
confusing.

Fixes #2013