More work on validation

Updated grid.dart

rename some flutter command references in readmes

make the ios development path less mandatory

Revert "iOS: Treat the initial Info.plist string as a mustache templa…

Revert "iOS: Treat the initial Info.plist string as a mustache template and use the project name to initialize the bundle name and identifier"

This reverts commit dd4361bc.

We still use the hard-coded name in a number of places, including
launching the app on the iOS simulator.

Fixes #1950

Update the regex used to filter out Flutter specific logs

Perform an engine version check on start and update the Xcode project if necessary

iOS: Treat the initial Info.plist string as a mustache template and use the project name to initialize the bundle name and identifier

iOS: Treat the initial Info.plist string as a mustache template and use the project name to initialize the bundle name and identifier

Improve error message when Android SDK not found

Also, look for the Android SDK in the default locations.

Added Grid row and column spacing, changed padding interpretation

Grid padding now defines the distance the overall grid is inset. The grid rowSpacing and columnSpacing attributes define the space between rows and columns respectively.

Add iOS configuration files for all examples and remove GN related files

Hide flutter run_mojo

Add iOS specific assets to the Stocks example

Remove flutter ios command

All the functionality of this command has been integrated into other commands.

Refactor: Rename initialize_xcode.dart to setup_xcodeproj.dart

Enforce that we get a final move to the pointer up location

`flutter start` initializes the Xcode project if the user has not already done so.

Previously we asserted that we got a pointer move to the location where the
pointer up occured, but not all sources of pointer packets respect that
invariant. Specifically, on the iOS simulator, of you drag outside the window,
you'll get a stream of pointers that violates that invariant.

This patch teaches the converter to insert a PointerMoveEvent to move the
pointer to the location where the up occurs, repairing the invariant.

Fixes #1912

Dart SDK is no longer needed

Add docs for RepaintBoundary

Tooling updates for dealing with native services distributed in pub packages