Build out MATLAB test framework and core integration coverage

Tests/README.md

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+# Tests
+
+This folder is built around `matlab.unittest`.
+
+Primary entrypoint:
+
+```matlab
+results = run_all_tests();
+results = run_all_tests("profile","full");
+results = run_all_tests("profile","placeholder");
+```
+
+Profiles:
+
+- `fast`: implemented fast tests only
+- `full`: implemented non-hardware tests
+- `unit`: implemented unit tests
+- `hardware`: hardware-tagged tests
+- `placeholder`: explicit `assumeFail` placeholders
+- `all`: everything discovered under `Tests`
+
+To generate placeholders for untested classes:
+
+```matlab
+generateTests();
+```
+
+New tests should inherit from `IMDDTestCase` and use `TestTags` so they can
+participate in the profiles above.