`contracts-try` is now developed at
https://codeberg.org/topola/contracts-try and was extracted
from this repo, and rebased upon the original
crate sources to ensure proper attribution.
This removes the `vendored` directory.
We'll be following this pattern:
* `Autorouter` - `Autoroute`,
* `Router` - `Route` (not yet done),
* `Tracer` - `Trace`.
Agent nouns (ending with -er) denote the object that holds large and
"unportable" parts of the state (such as `Board`, `Layout`, `Drawing`,
`Geometry`), while verbs (ending with -e) denote holders of other, more
"portable" parts of the state.