New map style dependent on zoom, not customizable

[AMDmi3]

New map style brings several problems:

1) It's dependent on zoom. This is not acceptable for advanced editor, as a mapper should always see all objects in area on any zoom, including their types (e.g. icons) and complexity (e.g. nodes). At least there should be an option to do so.

2) Road labels are unreadable when antialiasing is disabled (and here it is disabled, as JOSM is too slow to render dense map data eevn without it). There's no way to disable labels either.

I haven't found a way to fix these problems in the style, it seems that zooms and labels are handled inside the renderer. I haven't found any relevant knobs in `Advanced Prefereces' either. So for now there's no other way than to stick with old XML style.

So, minimal customization abilities should be added, which don't look too complex:

• an option to fix zoom level for renderer
• an option to disable labels for ways