Veljko Tekelerović

Expand `freezing` to system `Cache` folder as an additional option.

Add new or update existing code examples.

Add a public method that allows changing field value of an already frozen `struct` without the need for unfreezing. New value should be present at next unfreeze attempt. eg: ```Swift...

Add a method that async returns raw data from a given endpoint.

Implement separate operation queue for background `I/O` operations.

This PR changed the following in `Fridge` interface and internalies - #54 - #55 It also addresses: - #40 - #26