Reordering regions does not work after boolean ops

[anibalsolon]

Bug! 🐞

After subtracting regions (probably adding too), the paper.js state & microdraw global state get desynced in the matter of ordering (i.e. Microdraw.ImageInfo[i].Regions vs paper.project.activeLayer.children[i]), so the function _isPaperRegionsOrderOk returns false.

To reproduce:

• Draw three overlapping regions (like a Venn diagram with 3 intersected, but not contained, sets)
• Select the topmost region
• Click in the subtract tool
• Click in the bottommost region
• Try to send to front or to back any region