ENH: add grid & rectilinear_interlaced interface pattern

Github: #1018, #1221
Jira: STUDIO-2534

Change-Id: I8c766b5b934364253c0344e39f474e4ac3b81add
(cherry picked from commit e7d46fe60856ab511905b46799943bfde8a71826)

src/libslic3r/Fill/FillBase.hpp

@@ -76,6 +76,7 @@ struct FillParams
     bool            using_internal_flow{ false };
     //BBS: only used for new top surface pattern
     float           no_extrusion_overlap{ 0.0 };
+    bool            dont_sort{ false }; // do not sort the lines, just simply connect them
 };
 static_assert(IsTriviallyCopyable<FillParams>::value, "FillParams class is not POD (and it should be - see constructor).");