Removes (and returns) the first item in an ordered
container.
Behavior is undefined if the container is empty.
| delete-first :before < metabang.cl-containers:abstract-queue > |
| delete-first < metabang.cl-containers:basic-queue > |
| delete-first < metabang.cl-containers:list-container > |
| delete-first < metabang.cl-containers:priority-queue-on-container > |
| delete-first < metabang.cl-containers:ring-buffer > |
| delete-first < metabang.cl-containers:sorted-list-container > |
| delete-first < metabang.cl-containers:vector-container > |