Follow-up to #7625

Required for https://github.com/flutter/flutter/issues/138

fixes #7623

I plan to use this to implement similar logic in SliverPadding.

To make this easier to test I extended the paints matcher to accept a
function that takes a canvas. While I was at it I also made it accept
a Finder, it'll go and find the render object for you.

Also added support for paints..path and fixed some grammar in the
error messages.

Also improved the docs for debugPaint*.

This widget is a replacement for ScrollableViewport that uses the new
Scrollable2 machinery. The widget is not based on Slivers but does use the new
scroll behavior classes.

This brings the Windows script up to par with the Linux/Mac script.

`flutter doctor` works.

There are two scripts (`bin/flutter` and `bin/internal/update_dart-sdk`), which are platform dependent (bash script on Linux/Max, PowerShell script on Windows) and we need to keep an eye on making sure that their logic stays in sync. Both scripts are rather simple and I am not expecting many changes to them. I also made sure that both versions follow the same structure to make it easier to keep them consistent.

Required for https://github.com/flutter/flutter/issues/138

Latest patch release, aligned with the internal SDK roll.

We need to pin `package:process` because version 1.0.1 contains a breaking
change to the package's API.

This patch contains some basic tests for PaginatedDataTable.

Answers http://stackoverflow.com/questions/41729278/why-is-this-icon-being-clipped

This package depends on package:process now.

This patch adds a basic test for the DataTable widget.

Make debugging tests in a debugger easier.

Fixes https://github.com/flutter/flutter/issues/163

* Disable 'Show Excluded' by default

* Move .iml file inside .idea dir

* Remove pub and build excludions as they are automatically set by the Dart plugin

* Exclude .idea folder (new users will edit it through the IJ UI, not the file)

* Move .iml files into .idea dir to be consistent with template changes

* Add workspace.xml from new template to existing samples

* Update current examples to match template changes for excluding folders

* Add missing flutter.yaml to make sure there are no analysis errors

* Add back .pub and build excludeFolder tags per https://github.com/flutter/flutter-intellij/issues/630#issuecomment-272887230

* Remove workspace.xml from example per review feedback

...now that we have generic methods, their types need to be specified too.

Teach `paints` matches about `drawRect` and how to `paintChild`.

Also, improve test coverage.

See https://github.com/dart-lang/sdk/issues/28463, which I think is a
regression.

This also fixes the regression introduced by
https://codereview.chromium.org/2559773002 whereby we were no longer
checking any of the lints.

Refactor DevFS so that it's easier to add new types of content such as kernel code
* add tests for DevFS package scanning
* add tests for DevFS over VMService protocol
* which covers _DevFSHttpWriter and ServiceProtocolDevFSOperations
* replace AssetBundleEntry and DevFSEntry with DevFSContent
* refactor to cleanup common code and replace some fields with locals
* rework .package file generation refactor away DevFSOperations.writeSource
* only update .package file if it has changed
* only write/delete/evict assets that have been changed/removed

hideText -> obscureText
hideDivider -> !showDivider