Miss-hit

* Fix issue with MATLAB functions embedded in Simulink. Usually people
left the default name (i.e. `fcn`) which caused many duplicate items
to appear in the `mh_trace` output. Now embedded functions use the
name of the subsystem (i.e. what you'd see in Simulink as the name).

* Fix parsing bug for argument and property validation blocks. The
list of validation functions may be empty, previously the MISS_HIT
parser complained about non-empty lists.

* Fix tool crash when encountering a Simulink area annotation with no
text. These annotations are now properly supported and you can even
add tracing text to them.

* Add another method of tracing Simulink models via [block
properties](https://www.mathworks.com/help/simulink/ug/block-properties-dialog-box.html).

* The top-level system of a Simulink Library (but not Model) no longer
appears in the tracing output, as there is no way to access or
manipulate this in the Simulink user interface.

* Add new option `--untagged-blocks-inherit-tags` for `mh_trace` which
cases any untagged system to inherit any tags from its parent. Once
new tags are encountered this breaks the inheritence chain. Note
that embedded MATLAB blocks are unaffected by this option.

* Fix issue where a Simulink model with self-contained links would not
parse the referenced systems. Only the top-level system would be
parsed and references were never followed.

* Fix issue where a Simulink model with referenced stateflow would not
parse the referenced machines and charts.

* Fix issue in `mh_trace` where sometimes LOBSTER tags could be
generated which contained spaces.

* Support multi-line and HTML annotations in Simulink for `mh_trace`
annotations.