Redo dependency system

[viccuad]

Provide a new implementation for a dependency system.
Ideally, it would look similar or if not the same to https://github.com/cloudfoundry-incubator/kubecf/tree/master/scripts/tools.

Some constraints that have popped up:

• Needs to be flat. No utilities should be pre-depended on before others (eg: current catapult depends on jq to be able to craft configs, that may be used later on to obtain yq).
• Obtained dependencies must be stored in a way so they are cacheable (by CI, etc). Bonus points if they don't get redownloaded every time one creates a new build dir for a cluster.
• Needs to support several versions of binaries. E.g: kubectl versions. These versions will get used on the test environment, depending on the cluster k8s version.