TextField and CupertinoTextField can now specify scrollPhysics. Cupertino defaults to bouncing now.

Adds the `minLines` and `expands` parameters for controlling text height.  The original PR was reverted, so this one contains a few extra fixes for the tests that were broken.

Fix the spelling errors in the dartdocs for the framework.

There are no functionality changes here, just documentation fixes.

* Fix for #26261. Changes CupertinoTextField's cursorColor to read from CupertinoTheme instead of prior default of activeBlue. CursorColor will still default to activeBlue for light theme and activeOrange for dark theme if a primary color has not been specified for the CupertinoTheme.

* Reverted unnecessary changes in XCode file.

* Updated text_field.dart per suggestions from @gspencergoog

* Updated comments for cursorColor to reflect appropriate hyperlinks per @Hixie

* Simplified cursorColor assignment per @xster

* Added test in cupertino/text_field_test.dart to check for correct cursorColor based on CupertinoTheme per @Hixie & @xster.

* Fixes cursor on iOS devices

* adds force press select word functionality

* Adds support for floating cursor.

This reverts commit 46878d84.

* Adds support for floating cursor!

This converts existing ## Sample code samples to {@tool sample}...{@end-tool} form.

Also:
1. Fixed a minor bug in analyze-sample-code.dart
2. Made the snippet tool only insert descriptions if the description is non-empty.
3. Moved the Card diagram to before the code sample.