Support wedge and pyramid elements

[KnutAM]

Wedge (Ferrite-FEM/Ferrite.jl#581) and pyramids (Ferrite-FEM/Ferrite.jl#623) are supported by Ferrite.

Need to also update the example with custom elements. The easiest and most useful here would probably be to include interface/cohesive elements following FerriteInterfaceElements.jl.

Notes for implementation

Abaqus node ordering is as follows:

Codes for stress elements

• Linear wedge (6-noded): C3D6, C3D6H
• Quadratic wedge (15-nodes): C3D15, C3D15H
• Pyramid (5-noded): C3D5, C3D5H (Not possible to generate with Abaqus CAE, but good to support in case other mesh generators are used to output abaqus .inp files)