struct update deprecated sytnax

[IvanIvanoff]

Changes

• Stop using %StructModule{struct | ...} update syntax
• Find and remove some more %StructModule{struct | ...} update syntax occurrences
  • Use regex %(\w+)\{[\r\n\s]*(?<struct>\w+)[\r\n\s]* \| and replace with %{$2 |
• Add pattern matching in function header

Relevant Elixir Issue: elixir-lang/elixir#13974

Instead of using %Module{struct | ...} prefer pattern matching %Module{} = struct in the function head/case clause/etc. This should work better with the type system.

Ticket

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have tried to find clearer solution before commenting hard-to-understand parts of code
• I have added tests that prove my fix is effective or that my feature works