Merge pull request #691 from cs-extended/task/psr-12

Dont require grouping of namespaces

proposed/extended-coding-style-guide.md

@@ -145,9 +145,6 @@ You MUST NOT use `use` statements for classes in the root namespace. Therefore
 you should use `throw new \Exception();` instead of
 `use Exception; throw new Exception();`
 
-Multiple classes, functions, or constants within one namespace MUST group use
-statements within one namespace.
-
 Use statements MUST be in blocks, grouped by varying entity (classes [inc. interfaces and traits],
 functions or constants). To elaborate, this means that any and all classes are in a block
 together; any and all functions are in a block together; and any and all constants must