Add dart.suppressTestTimeouts to control suppressing timeouts when ru…

…nning tests

Fixes Dart-Code#3687.

Add customTool support for Dart web

Fixes Dart-Code#3656.

Switch paths to Windows separators on Windows

Fixes Dart-Code#3643.

Improve handling of type args in textmate grammar

Fixes Dart-Code#3633.

Add support for hot reload in Dart projects

Fixes Dart-Code#2708.

Prepare v3.27.2

Prepare v3.27.1

Prepare v3.27.0

Ensure if we reuse an old node, it's added back to the parent

Try to initialize Flutter if we don't otherwise find a Dart SDK throu…

…gh normal paths

Fixes Dart-Code#3580.