Fallback source usages names

Adds a list of source usages that are not displayed in the modal, but
if mappings with those usages exist, they can get a readable label.

It includes the non-overlapping usages from the mouse/gamepad sets (so
that the non-conflicting usages get proper labels even if the set they
belong to is not the currently selected one) and some alternative
gamepad trigger usages.

config-tool-web/code.js

@@ -1446,6 +1446,9 @@ function readable_usage_name(usage, default_to_hex = true) {
     if (usage in usages['source']) {
         return usages['source'][usage]['name'];
     }
+    if (usage in usages['source_extra']) {
+        return usages['source_extra'][usage]['name'];
+    }
     if (((usage & 0xFFFF0000) >>> 0) == BUTTON_USAGE_PAGE) {
         return 'Button ' + (usage & 0xFFFF);
     }

config-tool-web/usages.js

@@ -41,6 +41,20 @@ const usages = {
         "0x0009000f": { 'name': 'Button 15', 'class': 'gamepad' },
         "0x00090010": { 'name': 'Button 16', 'class': 'gamepad' },
     },
+    'source_extra': {
+        "0x00010038": { 'name': 'V scroll', 'class': 'mouse' },
+        "0x000c0238": { 'name': 'H scroll', 'class': 'mouse' },
+        "0x00010032": { 'name': 'Right stick X', 'class': 'gamepad' },
+        "0x00010035": { 'name': 'Right stick Y', 'class': 'gamepad' },
+        "0xfff90001": { 'name': 'D-pad left', 'class': 'gamepad' },
+        "0xfff90002": { 'name': 'D-pad right', 'class': 'gamepad' },
+        "0xfff90003": { 'name': 'D-pad up', 'class': 'gamepad' },
+        "0xfff90004": { 'name': 'D-pad down', 'class': 'gamepad' },
+        "0x00010033": { 'name': 'L2 axis', 'class': 'gamepad' },
+        "0x00010034": { 'name': 'R2 axis', 'class': 'gamepad' },
+        "0x000200c5": { 'name': 'Brake', 'class': 'mouse' },
+        "0x000200c4": { 'name': 'Accelerator', 'class': 'mouse' },
+    },
     'source': {
         "0x000700e0": { 'name': 'Left Control', 'class': 'keyboard' },
         "0x000700e1": { 'name': 'Left Shift', 'class': 'keyboard' },