+Concrete walls

Added 2 types of concrete walls.
+Concrete constructions

Added concrete constructions: 2 walls.
+Concrete walls (Build Stages)
+ 2 qualities for concrete walls

+ SMOOTH: Used for smoothing the concrete. Possible further use: mortar at brick walls.
+ WELD: Used at the rebar cage. Possible further use: metal doors, etc.
+ Concrete related spawns

Added mixer, metal smoother (got no recipe, has to be found here), concrete and rebar as spawns in hardware stores. Need further relocation at PW spawn (Public Works).
+ Concrete wall build processes

Added build processes (with stages). Here the added qualities are used.
+ Crafting recipes

Added recipes for wood smoother (makeshift concrete smoother) and, obviously, concrete.
+ Concrete related tools

2 smoothers and the concrete mixer.
+ Concrete

Added concrete.
Filter sew menu by material
Filter item action inventory prompts
#Deleted tabs
#Changed descriptions
#Changed concrete terrain id's

Added t_ prefix, and changed some id's (namely, 2=halfway, and unified sconc and strconc)
#Changed terrain ID's

Same changes as in constructions.json
+ Concrete floors (and roofs)

+ Reinforced, and normal, concrete floors
+ Rebar cages
# Deleted tabs
+ Construction processes for roofs

Added construction processes for concrete roofs and floors.
Don't display inventory selector until soemthing is selected.
#Deleted tabs
#Deleted tabs