A command that can quickly filter a list of objects based on selected parameters would be nice, similar to the `countSide` command except returning a new array.
There are many cases where people want to filter an array of objects with constant parameters, so using the `select {}` command is a huge waste of performance when the array is large.
Some examples:
```
_arrayOfObjs selectObjectClasses [ ["class1", "class2", ...], (exactMatch = false)];
```
with `exactMatch`, class inheritance is ignored and only exact `typeOf` matches are returned.
```
_arrayOfObjs selectObjectSides [east, west];
```
I'll try to update this list if I come up with more common "static" filters.
These commands can be used together with such commands as `allObjects`, `units`, `allUnits`, `vehicles`, etc. Also, filtering trigger's `thisList` would be nice too (though for that countSide is usually enough)