Reorganize: kebab-case names, per-item subdirectories, regroup items

v1/scad/lib/prusa-enclosure/washer.scad

@@ -0,0 +1,18 @@
+module prusa_enclosure_mount_washer() {
+    difference() {
+        // Base
+        cube([8.9, 14, 1.5]);
+
+        // Through screw hole
+        translate([3.5, 7, -1])
+        cylinder(h=3.5, d=3.3, $fn=50);
+    }
+    
+    translate([7.5, 3, 2.5])
+    cube([2, 2, 2], center=true);
+    
+    translate([7.5, 11, 2.5])
+    cube([2, 2, 2], center=true);
+}
+
+prusa_enclosure_mount_washer();