New Features:
- devspace enter: opens a terminal or executes a command in the specified devspace container
- devspace add/remove/list package: easily add helm charts as dependencies to your devspace
- devspace up cmd: execute the specified command and parameters directly in the devspace
- devspace up -c: specify the container to which the cli should connect to
- add buildArgs, target and network option in config.yaml for better docker build handling
- add containerName, command option in config.yaml to specify devspace up & enter behaviour