- correct the case of `dynamicSettingsRegister` and `dynamicSettings` which are `dict`, not
classes.
- Use new `DynamicSettingsCollection` as base class for classes dynamically built during
parsing, to avoid name conflict.
- Use `DynamicSettingsCollection` instead of `dict` in dynamic field (`plugin` and
`component`). This correct inconsistency, and make linters happy.
- Catch `TOMLDecodeError` when parsing config, to show a more readable error message
instead of full backtrace.
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