This reverts commit 400bc9cf1d.

* [maven-release-plugin] prepare release v8.13.0

* [maven-release-plugin] prepare for next development iteration

Remove unused leading_zero_possible field from phonemetadata.proto

Deleted all methods that refer to this.
Regenerated jars - because we no longer write a boolean for the removed proto field, all the java metadata files needed regenerating too.

* appengine-api-1.0-sdk --> appengine-maven-plugin

* readme

* relative path instead of absolute

Co-authored-by: penmetsaa <penmetsaa@google.com>
Co-authored-by: Tijana Vislavski Gradina <tijanavg@google.com>

* Using precompiled templates with SoySauce instead of Tofu runtime interpreter

* Use renderHtml() instead of renderText()

Co-authored-by: Tobias Rogg <26879902+roggnroll@users.noreply.github.com>

Co-authored-by: Tobias Rogg <26879902+roggnroll@users.noreply.github.com>

* [maven-release-plugin] prepare release v8.12.57

* [maven-release-plugin] prepare for next development iteration

Migration of Demo to Soy/Closure templates

* [maven-release-plugin] prepare release v8.12.56

* [maven-release-plugin] prepare for next development iteration

* added Mac setup instructions

* [maven-release-plugin] prepare release v8.12.55

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.12.54

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.12.53

* [maven-release-plugin] prepare for next development iteration

- Followup to PR #2773, where we started using official appengine Maven plugin than older ```maven-gae-plugin```
- ```appcfg``` script is deprecated and most of these works can be done through ```gcloud-appengine-sdk```
- More details in cl/333435946 (where we moved away from ```appcfg``` during the releases) and cl/xxxxx (We no more need any manual copy jar commands)

* [maven-release-plugin] prepare release v8.12.51

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.12.50

* [maven-release-plugin] prepare for next development iteration

* Removing old generated files when building new ones

* Removing old generated files when building new ones

* Removing old generated files when building new ones

Co-authored-by: penmetsaa <penmetsaa@google.com>

* [maven-release-plugin] prepare release v8.12.49

* [maven-release-plugin] prepare for next development iteration

* Metadata updates for release 8.12.49
* Update Release Notes refarding new metadata resources

* [maven-release-plugin] prepare release v8.12.48

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.12.47

* [maven-release-plugin] prepare for next development iteration

* Revert "Metadata updates for release 8.12.47 (#2754)"

This reverts commit 4f9dbce606.

* Fix carrier and geocoding data file paths

* Added new classes with behavior from MetadataManager & MetadataSource

* Replaced MetadataManager usages with new classes

* New PrefixDataIOHandler which packs data into a jar

* Added mockito-core jar to lib folder

* Added mockito-all jar to lib folder and updated tests to not use junit4 annotations

* Fixed prefix generation entry points

* Specific exception for missing metadata cases

* Small change in checking missing metadata cases

* [maven-release-plugin] prepare release v8.12.46

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.12.45

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.12.44

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.12.43

* [maven-release-plugin] prepare for next development iteration