Geckolib

This is the last sync version of this library. It has become too complex to keep both API types in the same codebase. The client samples have been updated and HA integration uses the async version.

If there are any other clients of this still using the sync version, this is the last version that I will be updating. Most of the recent work was on the async API but you might still be able to salvage some recent updates if you have a sync fork still going.

Actually push the changes to GIT before publishing a new release.

Expose water heater internal sensors so they can be exposed in home assistant

- Change min temperature from 15C to 8C
- Handle unnamed SPA (Issue 54)
- Prevent watercare from being out-of-range at the expense of knowing if it was ... it's more stable for users (40)
- Fixed async importlib code from blocking by using loop executor

Updated to latest SpaPackStruct to include recent models