Player iterators

[Mistrick]

Description

Create iterators for player loops. Do this for SPMod and for SPMod plugins.

PlayersItterReset();
Player player;
while (PlayersItterNext(PL_ITTER_EXCLUDE_HLTV | PL_ITTER_EXCLUDE_BOTS)) {
  player = PlayersItterGetPlayer();
  // Do some stuf
}

or

for(Player p = GetFirstPlayer(SOME_SEARCH_FLAGS); p; p.NextPlayer(/* flags? */))
{
	// code
}

How do we replicate the issue?

Expected behavior (i.e. solution)

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