Add expirimental dualshock3 mapping

mappings/dualshock3.conf

@@ -0,0 +1,32 @@
+abs_x = 0
+abs_y = 1
+abs_z = -1
+abs_rx = 2
+abs_ry = 3
+abs_rz = -1
+abs_deadzone = 0
+abs_dpad_x = -1
+abs_dpad_y = -1
+reverse_x = false
+reverse_y = false
+reverse_rx = false
+reverse_ry = false
+reverse_dpad_x = false
+reverse_dpad_y = false
+btn_west = 303
+btn_south = 302
+btn_north = 300
+btn_east = 301
+btn_select = 288
+btn_start = 291
+btn_mode = 304
+btn_thumbl = 289
+btn_thumbr = 290
+btn_tl = 298
+btn_tr = 299
+btn_tl2 = 296
+btn_tr2 = 297
+btn_dpad_up = 292
+btn_dpad_down = 294
+btn_dpad_left = 295
+btn_dpad_right = 293