Major version 3.0.0

[Tobias van Beek]

Description

We are getting more concrete plans for a new major version.

Tasks for the new major version

• Drop old PHP versions #1054
• Upgrade PDepend to version 3 ( pdepend/pdepend#702 )
• Clean up syntax where possible .
• Upgrade used tools.
• Decide if an upgrade guide is needed or only a release with changelog.
• Add option to get last V2 phar file from website.
• Review and merge existing PR's with breaking changes. https://github.com/phpmd/phpmd/pulls?q=is%3Aopen+is%3Apr+milestone%3A3.0.0

Remove deprecations

• RuleSetFactory getIgnotePattern -> getIgnorePatterns
• #746
• Other deprecations?

[Marc Würth]

We set up some pages for the new major version 3.0 in the repo wiki:

• 3.0-Goals
• 3.0-Ideas
• 3.0-Roadmap