Manual override and saving session load scaling

What's Changed

• New feature that allows manual override of charging, discharging and idle via a dropdown menu - see the documentation.

• New feature that allows users to set a load scaling during Octopus Saving sessions or during periods of manual rate overrides (e.g. power ups)

• Bug fixes and documentation improvements

• Details

  • Override by @springfall2008 in #635
  • Documentation updates, givtcp activity monitor, further explanation of config items by @gcoan in #625
  • Fix bug in monitor mode changing charge window by @springfall2008 in #636
  • Fix bug in car charging smart calculation by @springfall2008 in #637
  • Add manual idle time, fix bug in manual mode related to 60 minute slots by @springfall2008 in #638
  • Update customisation.md by @springfall2008 in #639
  • New saving session scaling feature by @springfall2008 in #640

Full Changelog: v7.14.45...v7.15.0