Work on applying the probed heightmap.

grbl.h

@@ -3,6 +3,7 @@
 #include <string>
 #include <utility>
 #include <vector>
+#include "heightmap.h"
 
 namespace grbl {
 
@@ -32,6 +33,7 @@ struct program {
     bool load_from_file(std::string filename);
     bool load_from_stream(std::istream& in);
     bool load_from_string(const std::string& content);
+    bool load_from_lines(std::vector<std::string> lines);
 
     void dump(std::ostream& out);
 
@@ -42,10 +44,11 @@ struct program {
     instruction instruction_at(size_t index) {
         return instructions.at(index);
     }
-
     bool is_loaded = false;
     std::string filename;
     std::vector<instruction> instructions{};
+    grbl::program apply_heightmap(grbl::heightmap& grid);
+    void save(std::string path);
 };
 
 }