Revive SBEtests

[LinqLover]

Closes #31.

[LinqLover]

@codeZeilen This one is ready now as well. One job of the latest job failed due to a temporary connectivity failure, unfortunately, I do not have a button to restart it.

• 859c0f6..5efe6de adjust the framework so that the SBEtests are run within CI. Additionally, I included the SBEScriptBuilderTest I wrote for internal purposes as part of #28 into the CI as well.
• 5efe6de..9c3a360 update a number of script outputs and their related descriptions in the book as described in the commit messages. In particular, I removed two sections about no longer existing concepts (CharacterTable and Smalltalk being a SystemDictionary instance).

If you need a more detailed description, please let me know.

[LinqLover]

See the inline comments

See the inline replies :-)

[codeZeilen]

Ready to go from my side :)