change handlermanager to use Map to prevent garbage

src/ViewModel/Global/connectionViewModel.ts

@@ -90,7 +90,8 @@ export default class ConnectionViewModel {
     constructor(public readonly coreViewModel: CoreViewModel) {
         this.updatePreviousAddresses();
 
-        coreViewModel.connectionModel.connectionChangeHandlerManager.addHandler(
+        coreViewModel.connectionModel.connectionChangeHandlerManager.setHandler(
+            "connection-view-model",
             this.connectionChangeHandler,
         );
     }

src/ViewModel/Global/coreViewModel.ts

@@ -100,7 +100,8 @@ export class Context {
         this.keystrokes.set(key, fn);
     };
 
-    constructor(public contextDebugDescription: string) {}
+    constructor(public contextDebugDescription: string) {
+    }
 }
 
 export class ContextHost<T> extends Context {

src/ViewModel/Global/fileTransferViewModel.ts

@@ -173,11 +173,11 @@ export default class FileTransferViewModel extends Context {
     constructor(public readonly coreViewModel: CoreViewModel) {
         super("file-transfer");
 
-        this.coreViewModel.fileTransferModel.fileHandlerManager.addHandler(
+        this.coreViewModel.fileTransferModel.fileHandlerManager.setHandler("file-transfer-view-model",
             this.handleReceivedFile,
         );
 
-        this.coreViewModel.fileTransferModel.readyToSendHandlerManager.addHandler(
+        this.coreViewModel.fileTransferModel.readyToSendHandlerManager.setHandler("file-transfer-view-model",
             () => this.initiateTransfer(),
         );