[PATCH] Use range based for in network code

[elexis]

About r17730: 18:13 <@leper> and that loop could use a range based for

While wiki:Coding_Conventions only states that range-based for should be prefered over for-each, the network code exclusively uses numerical loops. This patch changes all loops in the 3 relevant network files. Disclaimer: I dont like the patch, didn't enjoy writing it, pointless churn, wasted time and don't care if it's closed as wont fix.

[Itms]

I personally find it nice. I agree that it's never enjoyable to write such code but that's necessary if we want a tidy codebase.

Here is another version, with more cleanup and more const wherever possible.

[Itms]

And another one, with more >> and less exposure of S_m_foo types.

[Itms]

In 18091:

Cleanup of the network code (range-based for, remove spaces between angle brackets, and other little things).
Based on a patch by elexis, fixes #3907

[elexis]

(changed component to network)