Reduction in register writes

What's Changed

Changes to try to reduce register writes

• Reductions in the case of force export
• Reduction during low power mode

Fixes include:

• Reduction to register writes by @springfall2008 in #1683
• Unit test updates by @springfall2008 in #1685
• Planned export register write minimisation fixes by @springfall2008 in #1689
• Low power mode fixes/debug by @springfall2008 in #1691
• Low power mode optimisations by @springfall2008 in #1697

Bug fixes

• Catch rest error without crash by @springfall2008 in #1693
• Slot sorting using minutes not slot id by @springfall2008 in #1694

Full Changelog: v8.8.1...v8.8.2