Exposed exaggeration factor when rendering heightmap.

Added checkbox to select whether to run autoleveled program or not.
Heightmap can handle non integer from_x and to_x.

sender_app.h

@@ -115,12 +115,13 @@ private:
     nanogui::Widget *parameters_layer = nullptr;
 
     nanogui::TextBox *mpos_x_text = nullptr, *mpos_y_text = nullptr, *mpos_z_text = nullptr;
-    nanogui::ComboBox *cbo_work_offset = nullptr, *cbo_tool = nullptr, *cbo_jog_feed_rates = nullptr, *cbo_jog_distance = nullptr;
+    nanogui::ComboBox *cbo_work_offset = nullptr, *cbo_tool = nullptr, *cbo_jog_feed_rates = nullptr, *cbo_jog_distance = nullptr, *cbo_exaggeration = nullptr;
 
     nanogui::ToolButton *btn_pin_door = nullptr, *btn_pin_hold = nullptr, *btn_pin_reset = nullptr, *btn_pin_cycle_start = nullptr;
     nanogui::ToolButton *btn_pin_limit_x = nullptr, *btn_pin_limit_y = nullptr, *btn_pin_limit_z = nullptr, *btn_pin_probe = nullptr;
 
     nanogui::Button *btn_keyboard_jog = nullptr;
+    nanogui::Button *btn_run_autoleveled = nullptr;
     std::stringstream dro_ss;
     grbl::heightmap heightmap_grid;
 
@@ -136,6 +137,7 @@ private:
 
     std::vector<std::string> jog_distances = {"0.01", "0.1", "1", "10"};
     std::vector<std::string> jog_feed_rates = {"5", "100", "500", "1000"};
+    std::vector<std::string> exaggeration_factors = {"0", "1", "5", "10", "20", "50", "100"};
 
     int last_alarm = 0;