Prefer a `while`-statement to a `for`-statement when there is no obvious loop variable

Reason

Readability.

Example

int events = 0;
for (; wait_for_event(); ++events) {  // bad, confusing
    // ...
}

The "event loop" is misleading because the events counter has nothing to do with the loop condition (wait_for_event()). Better

int events = 0;
while (wait_for_event()) {      // better
    ++events;
    // ...
}

Enforcement

Flag actions in for-initializers and for-increments that do not relate to the for-condition.