small reorg, some improvements, readme updates

- fix hemtt config to copy example
- add measurements table in Readme
- ENTITY COUNTS
  - re add side tags
  - use `side group _x` for units and players
  - fix players_connected and add headless_clients
- get `_allUserInfos = allUsers apply {getUserInfo _x} select {count _x > 0};` from main loop and use in entity counts and player performance

addons/capture/fnc_player_performance.sqf

@@ -1,5 +1,7 @@
 #include "script_component.hpp"
 
+params ["_allUserInfos", [], [[]]];
+
 private _hashesOut = [];
 {
 	_x params ["_playerID", "_ownerId", "_playerUID", "_profileName", "_displayName", "_steamName", "_clientState", "_isHC", "_adminState", "_networkInfo", "_unit"];
@@ -23,6 +25,6 @@ private _hashesOut = [];
 			["desync", _desync]
 		]]
 	]);
-} forEach (allUsers apply {getUserInfo _x});
+} forEach _allUserInfos;
 
 _hashesOut;