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/random_search.cpp

@@ -0,0 +1,36 @@
+#include "random_search.h"
+#include <iostream>
+#include <cassert>
+
+template <
+  typename Scalar, 
+  typename DerivedX, 
+  typename DerivedLB, 
+  typename DerivedUB>
+IGL_INLINE Scalar igl::random_search(
+  const std::function< Scalar (DerivedX &) > f,
+  const Eigen::MatrixBase<DerivedLB> & LB,
+  const Eigen::MatrixBase<DerivedUB> & UB,
+  const int iters,
+  DerivedX & X)
+{
+  Scalar min_f = std::numeric_limits<Scalar>::max();
+  const int dim = LB.size();
+  assert(UB.size() == dim && "UB should match LB size");
+  for(int iter = 0;iter<iters;iter++)
+  {
+    const DerivedX R = DerivedX::Random(dim).array()*0.5+0.5;
+    DerivedX Xr = LB.array() + R.array()*(UB-LB).array();
+    const Scalar fr = f(Xr);
+    if(fr<min_f)
+    {
+      min_f = fr;
+      X = Xr;
+    }
+  }
+  return min_f;
+}
+
+#ifdef IGL_STATIC_LIBRARY
+template float igl::random_search<float, Eigen::Matrix<float, 1, -1, 1, 1, -1>, Eigen::Matrix<float, 1, -1, 1, 1, -1>, Eigen::Matrix<float, 1, -1, 1, 1, -1> >(std::function<float (Eigen::Matrix<float, 1, -1, 1, 1, -1>&)>, Eigen::MatrixBase<Eigen::Matrix<float, 1, -1, 1, 1, -1> > const&, Eigen::MatrixBase<Eigen::Matrix<float, 1, -1, 1, 1, -1> > const&, int, Eigen::Matrix<float, 1, -1, 1, 1, -1>&);
+#endif