separate all utility headers and sources

cosets/include/mesh.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <vector>
+
+#include "coxeter.hpp"
+#include "mirrors.hpp"
+#include "numeric.hpp"
+
+glm::vec4 identity(const std::vector<glm::vec4> &normals, const std::vector<float> &coords);
+
+glm::vec4 identity(const Mults &mults, const std::vector<float> &coords);
+
+glm::vec4 center(const Mults &mults);
+
+std::vector<glm::vec4> vertices(const Table *t_vert, const glm::vec4 ident);
+
+std::vector<int> edges(const Table *t_vert);
+
+std::vector<int> faces(const Table *t_vert);