Added Door <-> IfcDoor conversion

[srudenkoamc]

BACKGROUND:

• IFC serialization is to be improved.

DESCRIPTION:

• Moved Door class with related enums to Elements.
• Added Door <-> IfcDoor conversion.

TESTING:

• Added a test for Door -> IfcDoor conversion.
• Tested IfcDoor -> Door on AC-20-Smiley-West-10-Bldg.ifc (Representation: IfcMappedItem).
• Converted the door test resulting model back from IFC (Representation: IfcExtrudedAreaSolid).

FUTURE WORK:

• The conversion supports only left-hand, right-hand and double doors opening along with single swing and double swing. Other opening types aren't supported yet.
• IfcDoorLiningProperties and IfcDoorPanelProperties aren't supported.
• Add support for IfcFacetedBrep representation.

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This change is 

[srudenkoamc]

Looks good!

I assume that the Door.cs definition will be unified with the one from the Doors layout function.

Also, do you mind producing an IFC file with a door that I can review?

Reviewed 4 of 7 files at r1, 4 of 4 files at r3, all commit messages. Reviewable status: 1 change requests, 0 of 1 approvals obtained (waiting on @srudenkoamc)

Elements/test/ContentTests.cs line 94 at r3 (raw file):

        }

        // TODO: The test fails in 70 of 100 test runs. Uncomment when it is fixed.

Did you get this working?

The Door.cs definition will be unified with the one from the Doors layout function. After the merge I'm planning to make a separate PR to update 'Elements' in HyparSpace. During this I'll check if everything works and will remove the old Door definition.

About the test - I've just commented it for now because it sometimes does break the build and sometimes doesn't. Eric said that he worked with it and that he will take a look.