Refactored the plantuml module

Summary

Two main things were refactored:

• The recordtypes to plantuml function allows for more customizations, e.g. leaving out the legend and others.
• The to_graphics function uses a temporary directory for generating the files and furthermore is able to output customized formats.

Focus

The changes in recordtypes to plantuml are self-explanatory. The function to_graphics should be most intensively reviewed and tested (manually).

Test Environment

See the attached files which show an example script and example output for the demo instance that can be used for testing.

download_data_model.py

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