Semantic diffs aren't very helpful for us

[therealryan]

We use diff-match-patch in the report app for three things:

• The text diff component
• The coverage indicator
• The model change analysis

For the first of these usages we saw that the diff_cleanupSemantic wasn't actually very helpful for the sort of text that we were working with, so we left it out.

That method was already being called for the other two usages - this change removes those calls so that all diff operations are consistent.

In the process of this change we noticed that:

• Chrome is no longer putting a startup notice on stderr - we can remove our own shutdown notice
• Click from the model change analysis page to a change didn't work as expected - the diff component wasn't being refreshed correctly.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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