Improved layout for building placement. A mirrored building.

[dmitrynest]

Idea:
Improved layout for building placement. A mirrored building.
- When placing buildings next to each other, you need a special
yellow stripe that will appear at the moment when buildings
are on the same line.
- Up to 3 marking planes (2 horizontal and 1 vertical). From where
is the second horizontal line taken? If there is another one next to the building
a building that is exactly on the same line, but in a different plane, then
the band also appears.
- It is inconvenient to place buildings on one line without markings (you have to
do everything "by eye").
- Building mirroring with M key (for placement aesthetics).
- Perhaps now there are already such tools (but either I don't know about them, or
they are too clever). You need it easier.