v0.1.18: Use an abstract `Word` type (#27)
* Rename XLEN() to XLEN * Use an abstract Word sort instead of Int * Add documentation for the semantics * Correct LUI to be XLEN invariant * Refactor halting mechanism to avoid contextual functions * Update to actions/checkout@v4 * Set Version: 0.1.18 --------- Co-authored-by: devops <[email protected]>