Building igl statically and moving to the dep scripts

Fixing dep build script on Windows and removing some warnings.

Use bundled igl by default.

Not building with the dependency scripts if not explicitly stated. This way, it will stay in
Fix the libigl patch to include C source files in header only mode.

src/libigl/igl/find_zero.cpp

@@ -0,0 +1,48 @@
+#include "find_zero.h"
+#include "for_each.h"
+#include "any.h"
+
+template <typename AType, typename DerivedI>
+IGL_INLINE void igl::find_zero(
+  const Eigen::SparseMatrix<AType> & A,
+  const int dim,
+  Eigen::PlainObjectBase<DerivedI> & I)
+{
+  assert((dim == 1 || dim == 2) && "dim must be 2 or 1");
+  // Get size of input
+  int m = A.rows();
+  int n = A.cols();
+  // I starts by containing guess where 0 might be
+  I = DerivedI::Zero(dim==1?n:m);
+  Eigen::Array<bool,Eigen::Dynamic,1> found = 
+    Eigen::Array<bool,Eigen::Dynamic,1>::Zero(dim==1?n:m);
+  const auto func = [&I,&found,&dim](int i, int j, const int v)
+  {
+    if(dim == 2)
+    {
+      std::swap(i,j);
+    }
+    // Coded as if dim == 1, assuming swap for dim == 2
+    // Have we already found a zero?
+    if(!found(j))
+    {
+      if(I(j) != i || v == 0)
+      {
+        // either there was an implicit zero between the last element and this
+        // one, or this one is zero
+        found(j) = true;
+      }else
+      {
+        // If not found, then guess that next element will be zero
+        I(j) = I(j)+1;
+      }
+    }
+  };
+  for_each(A,func);
+}
+
+#ifdef IGL_STATIC_LIBRARY
+// Explicit template instantiation
+// generated by autoexplicit.sh
+template void igl::find_zero<bool, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::SparseMatrix<bool, 0, int> const&, int, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&);
+#endif