Documentation and code clean ups (MIQ related) (#971)

* remove commented code

* typo

* clean up list of the arguments

* typo

* typos and different names

* rename files due to a typo and remove double include

* remove comments that do not document the code but are used to comment out code or to store TODOs that should not be placed in the code, anyway.

* clean up the documentation

* remove commented code

* add information to the doc

* improve readability of the code

* typo and a missing space

* fix a typo: missmatch -> mismatch

* remove unnecessary header files

* typos

* changed to camel notation

* clean up

* typo

* add limitations into the documentation

* camelCase

* lost refactor

* unify the variable's names

* clean up

* clean up

* missed refactor

* clean up

* name in the doc

* name in the doc

* further nameing convention changes

* refactored names missed by clion.

* unify names

* align the constructor's args

python/python_shared.cpp

@@ -87,7 +87,7 @@ PYBIND11_PLUGIN(pyigl) {
            copyleft_tetgen_tetrahedralize
            cotmatrix
            covariance_scatter_matrix
-           cross_field_missmatch
+           cross_field_mismatch
            cut_mesh_from_singularities
            deform_skeleton
            directed_edge_orientations