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/main/fnc_captureLoop.sqf

@@ -24,19 +24,22 @@ GVARMAIN(captureLoop) = [
             ]
         ];
     
+
+        // getUserInfo for all users
+        private _allUserInfos = allUsers apply {getUserInfo _x} select {count _x > 0};
         // entity_count returns an array of hashMap
         {
             GVARMAIN(extensionName) callExtension [
                 ":INFLUX:WRITE:",
                 [_x]
             ];
-        } forEach (call EFUNC(capture,entity_count));
+        } forEach ([_allUserInfos] call EFUNC(capture,entity_count));
         {
             GVARMAIN(extensionName) callExtension [
                 ":INFLUX:WRITE:",
                 [_x]
             ];
-        } forEach (call EFUNC(capture,player_performance));
+        } forEach ([_allUserInfos] call EFUNC(capture,player_performance));
 
         ["DEBUG", format[
             "Processed primary data loop in %1 ms",