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/grid_search.h

@@ -0,0 +1,42 @@
+#ifndef IGL_GRID_SEARCH_H
+#define IGL_GRID_SEARCH_H
+#include "igl_inline.h"
+#include <Eigen/Core>
+#include <functional>
+namespace igl
+{
+  // Solve the problem:
+  //
+  //   minimize f(x)
+  //   subject to lb ≤ x ≤ ub 
+  // 
+  // by exhaustive grid search.
+  //
+  // Inputs:
+  //   f  function to minimize
+  //   LB  #X vector of finite lower bounds
+  //   UB  #X vector of finite upper bounds
+  //   I  #X vector of number of steps for each variable
+  // Outputs:
+  //   X  #X optimal parameter vector
+  // Returns f(X)
+  //
+  template <
+    typename Scalar, 
+    typename DerivedX, 
+    typename DerivedLB, 
+    typename DerivedUB, 
+    typename DerivedI>
+  IGL_INLINE Scalar grid_search(
+    const std::function< Scalar (DerivedX &) > f,
+    const Eigen::MatrixBase<DerivedLB> & LB,
+    const Eigen::MatrixBase<DerivedUB> & UB,
+    const Eigen::MatrixBase<DerivedI> & I,
+    DerivedX & X);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "grid_search.cpp"
+#endif
+
+#endif