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Smart Unmerge — attach and detach stuff without limits

This not-so-simple modscript allows you to properly unmerge your ships and tools, without fancy unmergeable mods or sophisticated "unmerge-capable" docking corridors.

As most of SE players know, there is an inconvenience with merge blocks: if two merging grids have adjacent mount points that do not belong to a merge block's face (i.e. merging two 3x3 flat cubical corridors), they will weld together, and stay glued when merges are turned off. It is also very inconvenient when you need to transfer cargo between merging parts: instead of a simple tube, you have to use a merge/connector pair.

Right before the merge happens, all merge blocks will remember a list of blocks which belong to their grid. Upon they are turned off (or disabled), they will attempt to break away the blocks which originally belonged to their separate grids.
In case any block is added to the grid during the merge, the merge blocks will find all blocks adjacent to the new block and, if it touches only blocks from one formerly separate grid, new block will be added to that grid's block cache. In case the block is adjacent to blocks from both grids, it will be attributed to closest merge block.
Block caches are persistent and properly saved and loaded with the world.

Tip: if you want to disable "Smart Unmerge" option for a specific merge block, you can just write NoSmartMerge option in merge block's Custom Data.

It is tested with multiple merge blocks, but only in single player.

— Add a "Separate top block" option to Projectors, so you can easily detach freshly-projected stuff;
— Make a better thumb.