Closes #936
Closes #788
Closes #337

Changes proposed in this Pull Request

• Adds components class example to docs as expermiental feature to showcase and get feedback/ ideas
• Adds a couple of simple properties: c.units, c.ports and c.nominal_attr
• n.rename_component_names and c.rename_component_names to rename component names across all references in network (method for updating component attributes #788)
• c.calculate_line_length (Add function for auto-calculating line lengths from bus coords #337), not sure if this is what you had in mind @FabianHofmann

Checklist

• Code changes are sufficiently documented; i.e. new functions contain docstrings and further explanations may be given in doc.
• Unit tests for new features were added (if applicable).
• A note for the release notes doc/release_notes.rst of the upcoming release is included.
• I consent to the release of this PR's code under the MIT license.