Simplify test suite to pytest unit scaffolding

tests/conftest.py

@@ -1,47 +0,0 @@
-def pytest_addoption(parser):
-    parser.addoption(
-        "--sim-tool",
-        choices=["questa", "xsim", "stub", "skip", "auto"],
-        default="auto",
-        help="""
-        Select the simulator to use.
-
-        stub: run the testcase using a no-op simulator stub
-        skip: skip all the simulation tests
-        auto: choose the best simulator based on what is installed
-        """,
-    )
-
-    parser.addoption(
-        "--gui",
-        default=False,
-        action="store_true",
-        help=""",
-        Launch sim tool in GUI mode
-
-        Only use this option when running a single test
-        """,
-    )
-
-    parser.addoption(
-        "--rerun",
-        default=False,
-        action="store_true",
-        help=""",
-        Re-run simulation in-place without re-exporting busdecoder
-
-        Useful if hand-editing a testcase interactively.
-        """,
-    )
-
-    parser.addoption(
-        "--synth-tool",
-        choices=["vivado", "skip", "auto"],
-        default="auto",
-        help="""
-        Select the synthesis tool to use.
-
-        skip: skip all the simulation tests
-        auto: choose the best tool based on what is installed
-        """,
-    )