Remove mouseEvents from Terminal

Depend on CoreMouseService directly

src/common/TestUtils.test.ts

@@ -31,6 +31,7 @@ export class MockBufferService implements IBufferService {
 }
 
 export class MockCoreMouseService implements ICoreMouseService {
+  public areMouseEventsActive: boolean = false;
   public activeEncoding: string = '';
   public activeProtocol: string = '';
   public addEncoding(name: string): void {}

src/common/services/CoreMouseService.ts

@@ -192,6 +192,10 @@ export class CoreMouseService implements ICoreMouseService {
     return this._activeProtocol;
   }
 
+  public get areMouseEventsActive(): boolean {
+    return this._protocols[this._activeProtocol].events !== 0;
+  }
+
   public set activeProtocol(name: string) {
     if (!this._protocols[name]) {
       throw new Error(`unknown protocol "${name}"`);

src/common/services/Services.ts

@@ -27,6 +27,7 @@ export const ICoreMouseService = createDecorator<ICoreMouseService>('CoreMouseSe
 export interface ICoreMouseService {
   activeProtocol: string;
   activeEncoding: string;
+  areMouseEventsActive: boolean;
   addProtocol(name: string, protocol: ICoreMouseProtocol): void;
   addEncoding(name: string, encoding: CoreMouseEncoding): void;
   reset(): void;