Add Global Constant STREAMFIELD_SETTINGS for site-wide rich text edit…

[GT-Codeur]

…or consistency

[brylie]

This looks great. Please resolve the conflicts so we can merge the PR 🙂

[pep8speaks]

Hello @GT-Codeur! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file events/models.py:

Line 2:1: E402 module level import not at top of file
Line 3:1: E402 module level import not at top of file

• In the file magazine/models.py:

Line 5:1: E402 module level import not at top of file
Line 6:1: E402 module level import not at top of file
Line 273:1: E122 continuation line missing indentation or outdented
Line 275:1: E122 continuation line missing indentation or outdented