Use easy-peasy to store file state data

package.json

@@ -27,6 +27,7 @@
         "sockette": "^2.0.6",
         "styled-components": "^4.3.2",
         "use-react-router": "^1.0.7",
+        "uuid": "^3.3.2",
         "ws-wrapper": "^2.0.0",
         "xterm": "^3.14.4",
         "xterm-addon-attach": "^0.1.0",
@@ -50,6 +51,7 @@
         "@types/react-router-dom": "^4.3.3",
         "@types/react-transition-group": "^2.9.2",
         "@types/styled-components": "^4.1.18",
+        "@types/uuid": "^3.4.5",
         "@types/webpack-env": "^1.13.6",
         "@types/yup": "^0.26.17",
         "@typescript-eslint/eslint-plugin": "^1.10.1",