Handle mouseover events in pointer event conversion

Fixes #1806

Also:
 - give card_collection an option to turn on or off the edit widgets
 - give card_collection an option to control text alignment (when not editing)
 - give card_collection a "dump" option to aid debugging
 - make the gesture detector report which gestures it is listening to

Restore previous tap behaviors: no timeout, one pointer

Be explicit about whether text styles inherit

Don't use a timeout to cancel tap tracking. Track only one primary pointer
and ignore non-primary pointers. Update tests to reflect desired behaviors.

Fixes #1779, #1780, #1781.

Adds motors to revolute joints and prismatic joints

Now TextStyle has a boolean "inherit" value, which controls whether null values
should use should inherit from the current default text style or whether they
should use their initial values.

Remove an unused variable from input_test

This concludes the fn3 port!

In the stock list, filter out any symbols that have not yet been fetched

Fix Stocks search mode back button.

debugPaintPointersEnabled mode

trivial cleanup in gesture code

better feedback for null child to a Block or Column

Radio<T> and ValueChanged<T>

This changes flutter's updater package to depend on and use the new flx
package. I also did a little cleanup of the Bundle interface.

If you load the example and immediately switch to the Portfolio tab, you may
see exceptions due to symbols that are in the portfolio list but whose
data is not yet present in the stocks map

Make Radio widgets take a type that describes the type of their value,
so that you can catch when you use the wrong value.

Standardise on ValueChanged<Foo> instead of having a FooValueChanged
for every value of Foo.

Keep the selection within bounds in deleteSurroundingText

Fixes #1687.

Back button wasn't reliably working in checked mode.

Implements a mode that highlights RenderBoxes while events are being
routed through them.

Also, moves the size painting to after paint, so that opaque boxes
don't obscure the debugging lines.

This makes skyanalyzer also check the examples, and fixes everything it
found there.

If the text is empty, the IME may call deleteSurroundingText(1, 0) if the user
hits the delete key.  The selection should remain at position 0 if this
happens.

Working node to physics world conversions

Teleportation for physics bodies works again

Hide the keyboard in a deferred task.

Delete OldTextPainter

Also, delete all references to DOM APIs.

This is intended to eliminate the flicker that occurs when one widget hides
the keyboard and then another shows it within the same update cycle.