DWG Export - better NPLT support

[lionel.kai]

The "NPLT" settings on the General tab (below) seem to imply that there's a way to ASSIGN elements to those layers, but there's not (only Line Styles work). There should be a note added to the dialog to indicate that (such as "Make layers (used for Line Styles) containing...") OR (better) add a way to assign layers to elements by type. For example, we use NPLT Text, Dimensions, Grids, Levels, and even sometimes Annotations Symbols and Detail Components, but there are only a few layer modifiers available, and no logic (i.e. we can't say if {Phase Status} is "Existing", and "-E" suffix). Ideally we'd be able to say something like: if {Type Name} contains "NPLT", add "-NPLT" suffix to layer name.