Add ability to access UAS WebTools

[Stackout]

To iterate, we could allow many plugins in the future. For now, I added the ability to either enable or disable webtools.

[billimek]

/lgtm

[onedr0p]

/lgtm ++

[onedr0p]

@Stackout There's actually a problem with this change somewhere:

ts=2020-01-22T00:06:03.633557928Z caller=release.go:188 component=release release=plex targetNamespace=default resource=default:helmrelease/plex helmVersion=v3 error="failed to determine if the release should be synced" err="failed to upgrade chart for release [plex]: template: kube-plex/templates/ingress.yaml:26:24: executing \"kube-plex/templates/ingress.yaml\" at <.Values.webtools.enabled>: can't evaluate field Values in type interface {}"