rewrite as CLI tool separating umbrella charts into sub releases

[sflandergan]

Card
When installing or upgrading an umbrella chart, bumbershoot should separate these into own releases per sub-chart.
These can be managed as one package with bumbershoot, but can also be independently managed via helm (maybe later also via bumbershoot).
This brings several benefits:

• each sub-release can be linted, giving better error feedback than using helm directly
• each sub-release can be updated in a CD scenario

Criteria

• Umbrella charts can be listed, installed, deleted and upgraded
• Umbrella charts are separated into sub-releases
  • (optional) depth until chart dependencies are resolved can be configured
• Dependencies between sub-releases are tracked
• When upgrading, any sub-chart that has been removed, must have the sub-release deleted