Also, some trivial fixes for things that I found while playing with
the rendering library directly.

Include BoxDecoration description in Container toString

Prepare flutter analyze for dart 1.14

fix framework to match new mojo sdk

The dart bindings changed semantics in a non-compatible way.

Remove Firebase flutter packge

fix links to new website

Update progress_indicator widget example

Update the progress_indicator demo: it was using Title explicitly, which is no longer needed.

Defend against a null color in updateTaskDescription. The color field in the TaskDescription struct (activity.mojom) isn't nullable.

Fixes #1248

Have BoxDecoration default to one-line dumps

Style nits in a rendering example

Tooltips

Introduces a new Tooltip class.
Adds support for tooltips to IconButton and Scaffold.
Adds some tooltips to various demos.

Also some tweaks to stack.dart that I made before I decided not to go
down a "CustomPositioned" route.

Stocks has both tabs reified in the wiget tree

PageStorage storage identifier should include the context widget's key

We were recomputing which widgets to show only when we were on the other side
of the repaint boundaries. That doesn't work well for pageable lists because we
come to rest exactly on a repaint boundary, which means we don't cull the other
page.

After this patch, we recompute the set of widgets using an edge-trigger when we
hit the boundary. That's better than using a level-trigger so that we don't
continuously recompute the set of widget as we sit at the boundary.

Switch back to GitHub hosting of stock data

The Firebase server seems to have changed behavior and is not giving us a List
instead of a Map. This patch switches us back to GitHub, which just serves the
same flat files all the time.

Remove flutter_sprites sound_manager.dart

Tweaks near Material, BoxDecoration, implicit animations.

Some more asserts and toString info.
Reorder some code to group lerp-related functions.

clarify that start defaults to checked

Handle degenerate transforms better

No you can't hit things inside degenerate transforms. Tranforming from global
coordaintes to degenerate local coordinates gives you Point.origin. Also,
upgrade vector_math to get a better invert constructor.

Fixes #1161
Fixes #1224

Remove clamp() in favour of double.clamp()

fixes to flutter analyze for the latest dev sdk

don't listen for chromium messages to the adb log

Fixes #1213.

Also, update callers of deprecated methods.

Floating Action Button transitions

When the scaffold's floating action button (FAB) is replaced the old FAB shrinks to zero and then the new one grows to its full size. When a FAB is shown, its child spins into place.

This is all intended to be a good approximation of the "Lateral Screens" section of the material design spec.

The fab.dart example is included as stop gap until the gallery and other demos have been updated.