TSAC-5193

Export Unitechnik (79): The export of the reinforcement from rebar assemblies is now supported. Rebar assemblies of the types Mesh, Bent mesh and Roll mat are collected and exported as mesh. The rebar assembly type is defined in rebar assembly properties. If the rebar assembly type is undefined or Cage, the rebar assemblies are exported as cages. Rebar assemblies of the type Braced girder are exported as braced girders, and those of the type Embed are exported as mountparts. As the cage is not supported in Unitechnik versions below 6.1.0., the cage rebars will be exported as loose.