Split Operators into two style categories

Background:
Qt Creator gives all C++ operator and punctuator tokens the same color. See cpphighlighter.cpp’s call to tk.isOperator().

User story:
Having logical operators in a bright color makes long if-expressions a bit easier to read (as long as that bright color isn't used elsewhere because then the color looses its "bright" highlighting effect).

Many other editors, for instance Sublime, does not highlight () {} [] ; , as operators even tough they are C++ operator tokens in the strict sense.

Solution:
Divide the C++ operator tokens into (two?) subcategories:

Arithmetic or logical operators: + - * / & | ++ – < > <= >= == && || ? etc
Enclosing or separating tokens: () {} <> [] ; , : :: . -> etc

Notes:
< > can both be used for comparisons and for templates so we will find them in both categories. Being able to color them differently allows users to "see" their semantics faster.