GitLab

Instead of requiring to add `cwd` to path, just use `gradlew` from the local folder. This is how most gradle wrapper projects are laid out

* Enhanced gradle plugin to parse tasks from a quick execution of the tool
* Added a duplicated function for gradlew completion that uses gradlew internally. Builds like Gradle itself (built with Gradle) are sensitive to being run with a matching gradlew version.
* Fixed broken caching of gradle task names. Added - and -- argument completions.