Adds scrollSensitivity option for scrolling speed

src/common/services/OptionsService.ts

@@ -33,6 +33,7 @@ export const DEFAULT_OPTIONS: ITerminalOptions = Object.freeze({
   letterSpacing: 0,
   logLevel: 'info',
   scrollback: 1000,
+  scrollSensitivity: 1,
   screenReaderMode: false,
   macOptionIsMeta: false,
   macOptionClickForcesSelection: false,
@@ -121,6 +122,12 @@ export class OptionsService implements IOptionsService {
           throw new Error(`${key} cannot be less than 0, value: ${value}`);
         }
         break;
+      case 'fastScrollSensitivity':
+      case 'scrollSensitivity':
+        if (value <= 0) {
+          throw new Error(`${key} cannot be less than or equal to 0, value: ${value}`);
+        }
+        break;
     }
     return value;
   }