Refactor the way we handle copy/cut/paste in Emacs mode

Previously we listened for the key bindings for copy, cut and paste in the Electron main process, and triggered the event using copy(), paste() and cut() methods on win.webContent. Now this is fully handled within the renderer process using the window.navigator.clipboard API.

This will make it simpler to implement fully customizable key bindings.

electron/main/index.ts

@@ -6,7 +6,6 @@ import fs from "fs"
 import { menu, getTrayMenu } from './menu'
 import { WINDOW_CLOSE_EVENT, SETTINGS_CHANGE_EVENT } from '../constants';
 import CONFIG from "../config"
-import { onBeforeInputEvent } from "../keymap"
 import { isDev, isMac, isWindows } from '../detect-platform';
 import { initializeAutoUpdate, checkForUpdates } from './auto-update';
 import { fixElectronCors } from './cors';
@@ -126,11 +125,6 @@ async function createWindow() {
         //win.webContents.openDevTools()
     }
 
-    // custom keyboard shortcuts for Emacs keybindings
-    win.webContents.on("before-input-event", function (event, input) {
-        onBeforeInputEvent({event, input, win, currentKeymap})
-    })
-
     // Test actively push message to the Electron-Renderer
     win.webContents.on('did-finish-load', () => {
         win?.webContents.send('main-process-message', new Date().toLocaleString())