ExposedThing initialization process not compliant

[relu91]

The Scripting API defines a Expand Thing Init, but currently, our ExposedThing stops at step 3. We should align it with the spec.

p.s. This causes #873, because the HTTP server receives a Thing object without any scheme defined when the CLI module tries to create the Servient Thing using a very simple ExposeThingInit without a security scheme.

[relu91]

To be precise we sort of implemented some later steps like 8.1, but we are not generating the title automatically. In general, the whole process needs to be reviewed and aligned.

[danielpeintner]

I think we should also create some tests to confirm that we follow all steps for "expand an ExposedThingInit"

[relu91]

While solving this issue keep in mind this thread from the PR above.