If the selected table column is string then show that in the singlestat

Adds support for value mapping for table data in the single stat panel.

If data is of type Table, then will return the first row of data. The
user can select which column should be shown in the SingleStat.

Fixes the homepath and config command line args. This allows the
command to be used even when the homepath is different from the
default.

Fixes #7730

typo in API URL

Add metrics/matches to Telegram notifications (proposed fix for #8110)