Added some (missing) feature in post 2.0  

Added some (missing) feature in post 2.0

A very usefull add (for me at least) would be

1. a "undo", so many times i just move the wrong object due to the mouse catching other object instead of handle of the current tool. Could be perfect with a small history undo/redo.
2. the ability to hide element especially enforcer/blocking/modifier volume. Some part need modifier and blocker/enforcer on the same area and you can really see with other volume already in place.
3. The enforcer should really CREATE support, and not support "if needed". I sometimes want just a small support (not all bridge or part) to secure  some element but i got a all or nothing with current added enforcer volume
4. the possibility to create perimeter of other type than linear (like "circle" or "zigzag", kind of big X accross perimeter  (or Y) ) to have the plastic melted together and not long aside lines.
5. Possibility to print up to 3 layer  (especially for small layer) so, layer are stronger in the Z axe.
6. A small indicator of progress (not necessary time but  with part is sliced, and maybe something like X% of this volume/element + Y elemenet of totlal element) during slicing.

NB: the post was already partially write under another post but lost due to different interest in added feature of original post, sorry for that