update some deisng parameters and add new cases

cases/gps/source/feather_case.scad

@@ -19,13 +19,14 @@ show_references = true;
 /* [Stack] */
 top_profile = "generic"; // [generic,gps,oled128x64]
 wing_count = 1; // [1:1:8]
-wing_pitch = 11; // [7:0.1:16]
+wing_pitch = 12.25; // [7:0.1:16]
 stack_height_override = 0; // [0:0.1:100]
 generic_component_height = 3; // [0:0.1:30]
 generic_top_gap = 2; // [0.5:0.1:10]
-gps_antenna_height = 4;
+gps_antenna_height = 6;
 gps_top_gap = 5;
 oled_component_height = 2.4;
+oled_display_height = 1.5;
 oled_face_gap = 0.8;
 
 /* [OLED controls] */
@@ -708,7 +709,7 @@ module reference_top_feature() {
                 cube([
                     oled_visible_size[0],
                     oled_visible_size[1],
-                    oled_component_height
+                    oled_display_height
                 ]);
         color([0.6, 0.6, 0.6, 0.9])
             for (xy = [