Add History Back and History Forward scancodes. Resolves #776.

packages/uhk-common/src/config-serializer/config-items/scancodes.json

@@ -509,6 +509,22 @@
                     "type": "media",
                     "scancode": 138
                 }
+            },
+            {
+                "id": "145",
+                "text": "History Back",
+                "additional": {
+                    "type": "media",
+                    "scancode": 548
+                }
+            },
+            {
+                "id": "146",
+                "text": "History Forward",
+                "additional": {
+                    "type": "media",
+                    "scancode": 549
+                }
             }
         ]
     },

packages/uhk-web/src/app/services/mapper.service.ts

@@ -326,6 +326,9 @@ export class MapperService {
         this.mediaScanCodeTextMap.set(394, ['Launch Email Client']);
         this.mediaScanCodeTextMap.set(402, ['Launch Calculator']);
 
+        this.mediaScanCodeTextMap.set(548, ['Hist -']);
+        this.mediaScanCodeTextMap.set(549, ['Hist +']);
+
         this.systemScanCodeTextMap = new Map<number, string[]>();
         this.systemScanCodeTextMap.set(129, ['Power Down']);
         this.systemScanCodeTextMap.set(130, ['Sleep']);