Move `BaseConfigurationOptimizer` one directory up.
Change `getOptimizerByDeviceAddress` to return `null` if unknown.
Temporarily deactivate RESOL DeltaSol CS Plus config optimizer.

The `require` for this config optimizer got committed by accident but
it is still work-in-progress and not part of the repository. This patch
deactivates the `require` until the optimizer is ready.
Change `ValueWrapper` to no longer iterate over already ignored values.
Ignore values whose selectorValueRef's value is still unknown.

This change delays transceiving e.g. temperature values until their
corresponding unit selector is known.
Add `selectorValueRef` to generated config data.
Add export for `BaseConfigurationOptimizer`.
Add tests for `ConfigurationOptimizer{,Factory}`.
Update config data for RESOL DeltaSol BX Plus.