ENH: enhance some functions of the wipe_tower

1.Add automatic calculation of the wipe_tower's brim width by height；
2.modify the min_depth_per_height and the default ridwidth

jira: none
Change-Id: Idd96bc90e8e631aa8481b559e1e9fec24c6b822f
(cherry picked from commit 4dd4e9e12c02d945a0ac3fd2020f75313c5b2cc9)

src/libslic3r/GCode/WipeTower.hpp

@@ -26,6 +26,7 @@ public:
 	// WipeTower height to minimum depth map
 	static const std::map<float, float> min_depth_per_height;
     static float get_limit_depth_by_height(float max_height);
+    static float get_auto_brim_by_height(float max_height);
 
     struct Extrusion
     {