Some further cleanups for MIQ (#998)

* Cleanups: unified arguments' names, variable types, unused variables removed, initialization of fileds. Many Clang-tidy hints have been applied, etc.

* ints should be unsigned

* changes overlooked duing refactorization

* changes overlooked duing refactorization

* changes overlooked duing refactorization

* changes overlooked duing refactorization

* changes overlooked duing refactorization and suggestions from @jdumas

* remove unneeded var.

* indents

* extract a constant

* a name changed

python/py_doc.cpp

@@ -443,13 +443,13 @@ const char *__doc_igl_cross_field_mismatch = R"igl_Qu8mg5v7(// Inputs:
   //                    across all face edges
   //)igl_Qu8mg5v7";
 const char *__doc_igl_cut_mesh_from_singularities = R"igl_Qu8mg5v7(// Given a mesh (V,F) and the integer mismatch of a cross field per edge
-  // (MMatch), finds the cut_graph connecting the singularities (seams) and the
+  // (mismatch), finds the cut_graph connecting the singularities (seams) and the
   // degree of the singularities singularity_index
   //
   // Input:
   //   V  #V by 3 list of mesh vertex positions
   //   F  #F by 3 list of faces
-  //   MMatch  #F by 3 list of per corner integer mismatch
+  //   mismatch  #F by 3 list of per corner integer mismatch
   // Outputs:
   //   seams  #F by 3 list of per corner booleans that denotes if an edge is a
   //     seam or not