Use Google Drive API v3 everywhere

[DarthVanger]

Some methods in google-drive-api.js/noteStorageAPI.js use Google Drive API v3, but some use v2.

For example, function getTextFileContents in noteStorageAPI.js uses Google Drive API v3:
https://github.com/DarthVanger/NeuralNotes/blob/master/src/storage/noteStorageAPI.js#L329

  const request = gapi.client.request({
    path: '/drive/v3/files/' + requestParams.fileId,

While function updateFileName in google-drive-api.js uses Google Drive API v2
https://github.com/DarthVanger/NeuralNotes/blob/master/src/api/google-drive-api.js#L119

  let request = gapi.client.request({
    'path': '/drive/v2/files/' + fileId,

Go through all the methods and switch from Google Drive API v2 to v3 everywhere.

See the article about v2 vs v3 differences: https://developers.google.com/drive/api/v2/v3versusv2