Feature: Unified info widget settings

[shamoon]

As discussed, this PR implements "unified" settings for info widgets. It also updates the glances and unifi_console info widgets to use this. Appreciate any input.

• Adds getPrivateWidgetOptions which optionally takes a widget type + index argument and returns... private widget options
• private settings (currently "url", "username", "password", "key") are removed from the widget options API response so theyre not passed as query vars

This allows for "unified" widgets.yaml (and multiple instances of a widget without needing id or anything), no settings.yaml needed 🎉

e.g. widgets.yaml:

- glances:
    url: https://1.2.3.4:61208
    username: user
    password: pass
    label: RaspPi

- glances:
    url: https://5.6.7.8:61208
    username: user
    password: pass
    label: AnotherMachine

- unifi_console:
    url: https://9.10.11.12:443
    username: user
    password: pass

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