Datahall avoid columns

[jamesbradleym]

This PR updates the Data Hall Layout function by adding some column avoidance logic. At this stage a rack will simply not be placed where it would intersect with a column. This adds 2 new functions GetColumnsInRoom and CheckIntersectsWithColumn.

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This change is 

[anthonie-kramer]

Reviewed 8 of 8 files at r1, all commit messages.
Reviewable status: 1 of 1 approvals obtained, 1 unresolved discussion (waiting on @jamesbradleym)

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LayoutFunctions/DataHall/hypar.json line 16 at r1 (raw file):

    {
      "autohide": false,
      "name": "Columns",

In the future, we would probably want to also add the "Structure" function, since it also produces columns