Yorm

- Renamed `yorm.base` to `yorm.bases`.
- Stopped creating files on instantiation when `auto=False`.
- Now automatically storing on fetch after initial store.

- Fixed attribute loss in non-`dict` when conversion to `dict`.
- Now automatically adding missing attributes to mapped objects.

- Moved all converters into the `yorm.converters` package.
- Renamed `container` to `containers`.
- Renamed `Converter` to `Convertible` for mutable types
- Added a new `Converter` class for immutable types
- Removed the context manager in mapped objects.
- Fixed automatic mapping of nested attributes.

- Fixed object overwrite when calling `utilities.update`.

- Fixed infinite recursion with properties that rely on other mapped attributes.

- Updated mapped objects to only read from the filesystem if there are changes.
- Renamed `store` to `sync_object`.
- Renamed `store_instances` to `sync_instances`.
- Renamed `map_attr` to `attr`.
- Added `sync` to call `sync_object` or `sync_instances` as needed.
- Added `update_object` and `update_file` to force synchronization.
- Added `update` to call `update_object` and/or `update_file` as needed.