Adding customization options to PiHole custom service

[emilywotruba]

Description

Currently, the PiHole custom service can only show the percentage of blocked queries. I was interested in other statistics, so I added two new items to its configuration:

• items an array of keys specifying in which fields of the api you are interested in
• format a string giving the format of the subtitle. Here, "{n}" will be replaced by the value of the n'th key from items

Examples: If we leave items and format empty, the old subtitle will be generated, so this addition does not break old configurations. This is equivalent to setting:

items: ["ads_percentage_today"]
format: "{0}% blocked"

Another interesting statistic:

items: ["queries_forwarded", "dns_queries_today"]
format: "{0} of {1} queries forwarded"

The second addition is that instead of a red disabled, the status will now be an orange dns only if blocking is off. This is because PiHole itself can be enabled while the blocking feature is disabled:

Fixes # N/A

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

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