icons for quadratic elements creation

diff --git a/resources/mesh_quad_edge.png b/resources/mesh_quad_edge.png
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diff --git a/resources/mesh_quad_hexahedron.png b/resources/mesh_quad_hexahedron.png
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diff --git a/resources/mesh_quad_pentahedron.png b/resources/mesh_quad_pentahedron.png
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diff --git a/resources/mesh_quad_pyramid.png b/resources/mesh_quad_pyramid.png
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diff --git a/resources/mesh_quad_quadrangle.png b/resources/mesh_quad_quadrangle.png
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diff --git a/resources/mesh_quad_tetrahedron.png b/resources/mesh_quad_tetrahedron.png
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diff --git a/resources/mesh_quad_triangle.png b/resources/mesh_quad_triangle.png
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