Support dependency charts stored locally with prefix/scheme file://

[mblixter]

Is your feature request related to a problem? Please describe.
It's not possible to add helm charts to the Templates if the chart have dependencies on charts stored locally. When trying to add such a chart , you get the error:

Error loading template
Head "file://../my-chart/index.yaml": unsupported protocol scheme "file"

Describe the solution you'd like
Helm has since v 2.2.0 supported dependcies in local charts https://helm.sh/docs/helm/helm_dependency/ / https://helm.sh/docs/chart_best_practices/dependencies/#repository-urls

# Chart.yaml
dependencies:
- name: nginx
  version: "1.2.3"
  repository: "file://../dependency_chart/nginx"

It would be good if Cyclops also supported local dependencies