Use logger in Gradle over println

[Astrashh]

Pull Request

Description

Replaces println calls with calls to Gradle loggers. The messages are set to log at INFO, which I believe won't show up by default, they seem to add a lot of noise when running tasks (subproject prints aren't really necessary to show all the time as gradle projects exists), but this can be up for discussion.

Checklist

Mandatory checks

• [x] The base branch of this PR is an unreleased version branch (that has a ver/ prefix) or is a branch that is intended to be merged into a version branch.
• [x] There are no already existing PRs that provide the same changes.
• [x] The PR is within the scope of Terra (i.e. is something a configurable terrain generator should be doing).
• [x] Changes follow the code style for this project.
• [x] I have read the CONTRIBUTING.md document in the root of the git repository.

Types of changes

• [ ] Bug Fix
• [x] Build system
• [ ] Documentation
• [ ] New Feature
• [ ] Performance
• [ ] Refactoring
• [ ] Repository
• [ ] Revert
• [ ] Style
• [ ] Tests
• [ ] Translation

Compatibility

• [ ] Introduces a breaking change
• [ ] Introduces new functionality in a backwards compatible way.
• [ ] Introduces bug fixes

Documentation

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

Testing

• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

Licensing

• [x] I am the original author of this code, and I am willing to release it under GPLv3.
• [ ] I am not the original author of this code, but it is in public domain or released under GPLv3 or a compatible license.