[in_app_purchase] Migrate maven repo from jcenter to mavenCentral (fl…

…utter#3916)

Point deprecated plugins to Plus versions (flutter#3971)

The Flutter Community Plus Plugins have achieved Flutter Favorite
status, so the Flutter copies will now be turned down. This updates all
the READMEs to announce the deprecation and eventually discontinuing of
the plugins, pointing to the Plus versions.

Part of flutter/flutter#83277

[webview_flutter] Migrate maven repo from jcenter to mavenCentral (fl…

…utter#3926)

[video_player] Add URL for exoplayer to maven for all dependents (flu…

…tter#3979)

JCenter has the older version of ExoPlayer that the plugin currently uses, but Google's maven server doesn't so we need to add a workaround in the short term for the removal of JCenter in flutter#3924 to avoid breaking clients of video_player.

This was not caught in presubmit because the video_player example had this same workaround left over from an issue several years ago that caused JCenter not to have that version either; that issue was since fixed, but the workaround was never removed. This removes the example-level workaround so the example won't mask exoplayer maven issues in the future.

(Also temporarily re-adds the workaround to the camera example, which broke post-publishing, to fix the tree. All example workarounds should be removable once this change is published.)

Point deprecated plugins to Plus versions (flutter#3971)

The Flutter Community Plus Plugins have achieved Flutter Favorite
status, so the Flutter copies will now be turned down. This updates all
the READMEs to announce the deprecation and eventually discontinuing of
the plugins, pointing to the Plus versions.

Part of flutter/flutter#83277

Point deprecated plugins to Plus versions (flutter#3971)

The Flutter Community Plus Plugins have achieved Flutter Favorite
status, so the Flutter copies will now be turned down. This updates all
the READMEs to announce the deprecation and eventually discontinuing of
the plugins, pointing to the Plus versions.

Part of flutter/flutter#83277

[quick_actions] Migrate maven repo from jcenter to mavenCentral (flut…

…ter#3920)

Point deprecated plugins to Plus versions (flutter#3971)

The Flutter Community Plus Plugins have achieved Flutter Favorite
status, so the Flutter copies will now be turned down. This updates all
the READMEs to announce the deprecation and eventually discontinuing of
the plugins, pointing to the Plus versions.

Part of flutter/flutter#83277

[local_auth] Migrate maven repo from jcenter to mavenCentral (flutter…

…#3917)

Point deprecated plugins to Plus versions (flutter#3971)

The Flutter Community Plus Plugins have achieved Flutter Favorite
status, so the Flutter copies will now be turned down. This updates all
the READMEs to announce the deprecation and eventually discontinuing of
the plugins, pointing to the Plus versions.

Part of flutter/flutter#83277