Pbixray

Universal macOS Support
* __Universal Binary for macOS:__ I've included a new `libxpress9.dylib` universal binary for macOS. The library now supports Intel (x86_64) and Apple Silicon (arm64, M1) architectures.

Add the flag `Assume referential integrity` to the `relationships` dataframe. It is surfaced as the column `RelyOnReferentialIntegrity`.

Added a new property `relationships` to the model which returns a dataframe with schema:

FromTableName | FromColumnName | ToTableName | ToColumnName | IsActive | Cardinality | CrossFilteringBehavior | FromKeyCount | ToKeyCount
-- | -- | -- | -- | -- | -- | -- | -- | --

The `statistics` now surfaces the `StructureModifiedTime` and `ModifiedTime` for a column.

Bug fix affecting column with compressed dictionaries