Potential fix for memory leak

• bump gradle, jdk, and kotlin versions
• attempt to address #25 by removing shutdown hook after stopping a task

Update gradle, kotlin, and jdk versions

Updates the gradle, kotlin, and jdk versions used to build the plugin.

Support for Gradle Configuration Cache

See #45 #46 #47 #48

Thanks to @DreierF and @cuichenli for their PRs

Shorten command line with pathing JAR

Thanks to @fbieler for this contribution

Fix Gradle 7.0 validation errors

Thanks to @melix and @henrik242 for their PRs. This release bumps some dependency versions and fixes #36

Add killDescendants option

Thanks to @mduft for the PR, this should fix #9 by adding a new killDescendants option (enabled by default).

Updated Gradle to 5.6

Thanks to @DreierF for the PR, this should fix #26

Make gradle version more explicit

Thanks to @DreierF, this should fix #20, #21, and #22

Fix ArrayStoreException and Gradle 5.3 errors

Thanks to @henrik242 for fixing #18. Should also fix #16.

Made (Java)ExecFork implement ProcessForkOptions

Thanks to @DreierF for his PR. This should fix issues #8 and #14.