Fix tag visibility and second show bugs

[bladtcasper-afk]

TagObject bugfixes

• [x ] Bug fix in a backwards-compatible manner.

Fixed bugs (2):

• In the viewer, the visibility of a tag could be changed individually, but it would not adhere to group visibility.

• If viewer.show() would be called twice in a script, the tags would not be shown the second time with the following error:
  'TagObject' object has no attribute 'text_aspect'

text_aspect is only assigned within TagObject.init() which is only initialised with Renderer.init() on the first viewer.show()

Checklist

• [x ] I added a line to the CHANGELOG.md file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• I ran all tests on my computer and it's all green (i.e. invoke test).
• I ran lint on my computer and there are no errors (i.e. invoke lint).
• I have added tests that prove my fix is effective or that my feature works.
  It is a small fix. I have changed the tag.py example file. This file will give an error using the current main compas_viewer, but will be fixed by the suggested update.