Fix: wall intersections where bounded areas are not being created

[katehryhorenko]

BACKGROUND:
The wall intersections were not created inside some visibly bound areas:

It happens on some E-shaped intersections:

The problem occurs when building a tree. The order of vertexes looks like this:

And the tree traversal with LeftMostPointComparer:

On step 2 the line on the right site is not added, because it's not the leftMost point. On step 3 the bottom line is removed as successor to upper line. So point 4 is never added to the tree:

The solution is two change events order and change the LeftMost point location for lines || to Y axis:

DESCRIPTION:

• This PR contains changes above and tests with different E-shaped networks

TESTING:

• A added tests

REQUIRED:

• All changes are up to date in CHANGELOG.md.

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This change is 

[ikeough]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! 1 of 1 approvals obtained