rJavaEnv 0.2.1

• Breaking change: java_check_version_cmd() and java_check_version_rjava() now return detected Java version instead of TRUE/FALSE

• New function use_java() to download, install and set Java from cache for the current sesssion, without touching the current project/working directory. This is intended for use with targets and callr.

• New vignette on using the package with targets' and 'callr

• Updated documentation with clearer instructions on cache folder cleanup before removing the package

• Depends on R > 4.0 to be able to write to the package cache directory without extra user warning. Cache cleanup and management functions are provided, as well as the documentation in both README and vignettes.

• Documentation and description clean-up