reorganize all the parts into subdirectories

src/ was getting pretty unreadable and I finally had time to do
something about it

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

src/misc/decorative-plate-sega-2p-plus-one.scad

@@ -0,0 +1,20 @@
+/*
+ * SPDX-FileCopyrightText: © 2023 Brian S. Stephan <bss@incorporeal.org>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+include <parameters.scad>
+include <components.scad>
+
+module sega_2p_plus_one_decorative_plate() {
+	difference() {
+		// get a 2mm slice of the bigger button cylinders
+		translate([0, 0, -55]) sega_2p_plus_one();
+		translate([0, 0, -100]) cube([500, 500, 198], center=true);
+		translate([0, 0, 100]) cube([500, 500, 198], center=true);
+		// cut out the normal holes
+		translate([0, 0, -1]) sega_2p_plus_one();
+	}
+}
+
+sega_2p_plus_one_decorative_plate();