Update ATtiny84 firmware to use Volume Up for shutdown, configure KeyMapper, and document automatic boot hotspot

Kicad/PCB_AndroidAuto.kicad_pro

@@ -514,7 +514,6 @@
         "priority": 2147483647,
         "schematic_color": "rgba(0, 0, 0, 0.000)",
         "track_width": 0.2,
-        "tuning_profile": "",
         "via_diameter": 0.6,
         "via_drill": 0.3,
         "wire_width": 6
@@ -533,7 +532,6 @@
         "priority": 0,
         "schematic_color": "rgba(0, 0, 0, 0.000)",
         "track_width": 1.37,
-        "tuning_profile": "",
         "via_diameter": 0.6,
         "via_drill": 0.3,
         "wire_width": 6
@@ -552,7 +550,6 @@
         "priority": 1,
         "schematic_color": "rgba(0, 0, 0, 0.000)",
         "track_width": 0.5,
-        "tuning_profile": "",
         "via_diameter": 0.8,
         "via_drill": 0.4,
         "wire_width": 6
@@ -571,14 +568,13 @@
         "priority": 2,
         "schematic_color": "rgba(0, 0, 0, 0.000)",
         "track_width": 0.15,
-        "tuning_profile": "",
         "via_diameter": 0.5,
         "via_drill": 0.4,
         "wire_width": 6
       }
     ],
     "meta": {
-      "version": 5
+      "version": 4
     },
     "net_colors": null,
     "netclass_assignments": null,
@@ -599,8 +595,10 @@
       "idf": "",
       "netlist": "",
       "plot": "",
+      "pos_files": "",
       "specctra_dsn": "",
       "step": "3D/PCB_AndroidAuto.stp",
+      "svg": "",
       "vrml": ""
     },
     "page_layout_descr_file": ""
@@ -724,8 +722,14 @@
     "page_layout_descr_file": "",
     "plot_directory": "",
     "reuse_designators": true,
+    "space_save_all_events": true,
     "spice_adjust_passive_values": false,
+    "spice_current_sheet_as_root": false,
     "spice_external_command": "spice \"%I\"",
+    "spice_model_current_sheet_as_root": true,
+    "spice_save_all_currents": false,
+    "spice_save_all_dissipations": false,
+    "spice_save_all_voltages": false,
     "subpart_first_id": 65,
     "subpart_id_separator": 0,
     "top_level_sheets": [