Reinforcement Addon

Introduction
The Reinforcement Addon augments the Arch Workbench by providing additional tools to create rebars for Arch Structures. The addon can be installed via the menu.

The addon is developed in a Github repository separate from the main FreeCAD repository.

Elements
The Arch Workbench provides only one rebar tool:
 * [[Image:Arch_Rebar.png|32px]] Rebar: creates a custom reinforcement bar in a selected Arch Structure using a Sketch.

The Reinforcement Addon provides additional rebar types:
 * [[Image:Arch_Rebar_Straight.png|32px]] Straight Rebar: creates a straight reinforcement bar.
 * [[Image:Arch_Rebar_UShape.png|32px]] UShape Rebar: creates a U-shaped reinforcement bar.
 * [[Image:Arch_Rebar_LShape.png|32px]] LShape Rebar: creates an L-shaped reinforcement bar.
 * [[Image:Arch_Rebar_BentShape.png|32px]] Bent Shape Rebar: creates a bent reinforcement bar.
 * [[Image:Arch_Rebar_Stirrup.png|32px]] Stirrup Rebar: creates a looped reinforcement bar.
 * [[Image:Arch_Rebar_Helical.png|32px]] Helical Rebar: creates a helix-shaped reinforcement bar.