Minor fixes & improvements, new compare_active entity

What's Changed

Improvements

Added new entity switch.predbat_compare_active which will be on when a tariff compare is running. Can be turned on to trigger a compare.

• Compare active entity by @springfall2008 in #2019

Made the web interface port configurable - only for docker users.

• Make web port configurable by @springfall2008 in #2020

Bug fixes

• Catch crash with time being None by @springfall2008 in #2007
• Fix crash with octopus saving slot by @springfall2008 in #2016
• Fix typos and improve documentation by @Moohan in #2001
• Fix currency format issue when page is loaded outside HA wrapper by @springfall2008 in #2017

New Contributors

• @Moohan made their first contribution in #2001

Full Changelog: v8.15.0...v8.15.1