In tools menu, boards belonging to each platform are grouped together.
The title of the groups is the board package name. When switching
between versions, mentioning the version number in package name helps
identify the installed version.
Rename board group from "ESP8266 Modules" to "ESP8266 Boards", to be
more similar to other platforms, and to reflect the fact that most
entries included are boards, not modules.
As an extra change, when building the boards manager package, set
version number in platform.txt based on git tag name. This saves one
step when creating the release — don't need to update platform.txt
twice.
Closes https://github.com/esp8266/Arduino/issues/5007.
* ci: work around tagging issue in Travis CI deployment
When `draft: true` is set, incorrect commit/tag information is sent to
Github. Override tag/target fields for correct behavior.
Ref. https://github.com/travis-ci/travis-ci/issues/9852
* doc: clarify some points in the release process
