Archways and windows

Adds new archways, windows, and some architectural pieces (and hopefully more to come) This mod changes the following: Added new archways in the Arches category Added new windows in the arched windows category Added two stand alone glass panels to the Architectural Misc. category Improved the resizing feature for the beam and wall boards in the Architectural Misc. category Improved the resizing feature for the basegame's invisible archways