Construction Tweaks and Fixes (#2253)

* Fixes reinforced Walls construction

when having one sheet left in the stack

* Amends Windoors

 - Assemblies are now made with two sheets of either normal or reinforced
   glass sheets, for normal and secure windoors respecting.
 - Assemblies can now be named with a pen, just like airlocks.
 - Windoor assemblies now get placed like windows, and windows take
   windoor assemblies into account when placed.
 - Decapitalises windoor assembly names.
 - Shattering windoors will make them drop exactly what they were made of
   now.
 - Prying emagged windoors will no longer make them shatter on top of
   returning to an assembly.
 - Cleans up a lot of code and gets its own update_icon() proc.

* Amends airlocks

 - Fixes airlocks occasionally not updating their icon correctly.
 - Fixes airlocks causing sparks on spawn as if they were damaged.
 - Fixes airlock not being anchored after being turned into an assembly.
 - Decapitalises airlock names.

* Windows that get unanchored by force will now correctly have the rotate verb.

* Adds changelog entry

code/game/objects/structures/window.dm

@@ -161,6 +161,7 @@
 	if(reinf) tforce *= 0.25
 	if(health - tforce <= 7 && !reinf)
 		anchored = 0
+		update_verbs()
 		update_nearby_icons()
 		step(src, get_dir(AM, src))
 	take_damage(tforce)