This reverts commit 9de7787f.

Now that the new schema is supported on the stable channel, and the old
schema is considered legacy, the template should always create plugins
using the new schema.

7ef053e74 Roll src/third_party/skia 2536b7f974b6..0e29459cda65 (1 commits) (flutter/engine#16839) (#51613)

Update Android activities because plugin registration is now done by FlutterActivity.configureFlutterEngine (#50841)

8ce165b31 Roll src/third_party/skia 93afe641d0be..7b3999edcb18 (2 commits) (flutter/engine#16830) (#51605)

When generating the plugin registrant for Linux, also generate a
makefile that can be included in the app-level Makefile to manage all of
the plugin targets and flags, exporting them in a few known variables
for use in the outer makefile.

Part of #32720

Working around https://github.com/flutter/flutter/issues/46173

* 8af3b1b4d Roll src/third_party/skia f0a13d04c233..7f5e3c7e43c7 (6 commits) (flutter/engine#16810)

* 060a7733a Roll fuchsia/sdk/core/linux-amd64 from QU3ft... to 94el1... (flutter/engine#16821)

This reverts commit f1cd47ef.

When Focus.unfocus is called, the caller usually just thinks about wanting to remove focus from the node, but really, unfocus is a request to automatically pass the focus to another (hopefully useful) node.

This PR removes the focusPrevious flag from unfocus, and replaces it with a disposition enum that indicates where the focus should go from here.

The other value of the UnfocusDisposition enum is UnfocusDisposition.scope.

UnfocusDisposition.previouslyFocusedChild is closest to what focusPrevious used to do: focus the nearest enclosing scope and use its focusedChild field to walk down the tree, finding the leaf focusedChild. This PR modifies it slightly so that it walks up to the nearest focusable enclosing scope before trying to focus the children. This change addresses #48903

A new mode: UnfocusDisposition.scope will focus the nearest focusable enclosing scope of this node without trying to use the FocusScopeNode.focusedChild value to descend to the leaf focused child. This is useful as a default for both text field finalization and for what happens when canRequestFocus is set to false. It allows the scope to stay focused so that nextFocus/previousFocus still work as expected, but removes the focus from primary focus.

In addition to those changes, unfocus called on a FocuScope that wasn't the primary focus used to unfocus the primary focus instead. I removed that behavior, since it was buggy: if the primary focus was inside of a child scope, and you called unfocus on the parent scope, then the child scope could have focused another of its children instead, leaving the scope that you called unfocus on with hasFocus returning true still. If you want to remove the focus from the primary focus instead of the scope, that's easy enough to do: just call primaryFocus.unfocus().

Fixes #48903

* Reland "Live image cache" (#51441)

This reverts commit 419a2853.

* Make evict safer

This reverts commit 69080e07.