Remember and Recall window layout so that position+size persist

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

package.json

@@ -96,6 +96,7 @@
     "css-raw-loader": "^0.1.1",
     "electron-builder": "^11.2.4",
     "electron-builder-squirrel-windows": "^11.2.1",
+    "electron-window-state": "^4.1.0",
     "emojione": "^2.2.7",
     "eslint": "^3.14.0",
     "eslint-config-google": "^0.7.1",