Allow additional floor types

[bpark1327]

Fixes #321

Renames FrameFloors/FrameFloor to Floors/Floor.
Renames WallType/StructurallyInsulatedPanel to WallType/StructuralInsulatedPanel
Adds FloorType with choices of:

• WoodFrame
• StructuralInsulatedPanel
• SteelFrame
• SolidConcrete
• Other

[bpark1327]

Some additional thoughts (#327 (review)):

• How do we specify additional light-weight concrete layer (e.g., gypcrete)? Moved to Additional floor mass #353
• Can we describe the joist material as metal? Yes.
• Can we describe floor trusses appropriately? Revisit existing FloorJoists and FloorTrusses elements @nmerket Moved to Describe floor trusses appropriately #354

[RockyMtnBrian]

Note that "SIP" stands for Structural Insulated Panel, as opposed to "structurally". If feasible, I suggest eliminating the "ly" part of the FloorType label.

[shorowit]

Thanks @RockyMtnBrian, I have fixed this. Because that name was already used for WallType, it's a breaking change.

I also discovered that @bpark1327 had added a new data type for floor type, but didn't actually add a FloorType element under Floor that uses it. That's now fixed too.

[RockyMtnBrian]

Just a thought, @shorowit: If there's a need to separately label the SIP wall vs SIP floor, then SIPWall and SIPFloor might do the job.

[RockyMtnBrian]

Note that SIPs get used for roofs, too. SIPRoof?

[shorowit]

@RockyMtnBrian There is not a need to distinguish SIP wall from SIP floor -- one will show up as Wall[WallType/StructuralInsulatedPanel] and the other will show up as Floor[FloorType/StructuralInsulatedPanel].

For roofs, it looks like the best place to add a SIP option under Roof would be in the DeckType element. (RoofType would be most consistent with WallType and FloorType, but unfortunately it's already used to describe the roofing material.)