Update dependencies

This update mostly focuses on improving the ergonomics than adding functionality.

• Updated dependencies
• Improved a lot of the documentation, readme, and tutorial
• Moved ExportMimeTypes to export_mime_types.dart and split them into categories according to the new documentation
• Removed DriveHelper.openFile() as it is too unreliable
• Made the DriveHelper class's constructor named and private, forcing use of the DriveHelper.initialise() function
• Improved most of the internal code to be more concise

Update dependencies

• Update dependencies
• Remove example
• Remove deprecated items

• Edited text in README.md
• Made the doc into a tutorial file and moved all API References to the dartdocs
• Deprecated DriveHelper.mime.files. Use FileMimeTypes
• Deprecated DriveHelper.mime.export. Use ExportMimeTypes
• Deprecated DriveHelper.scopes. Use DriveScopes
• Updated dart docs in drive_helper.dart to add missing comments from doc/DriveHelper.md
• Updated example app to abide by the deprecation notices
• Made exportFile() fix issue #1 as well

• Edited README.md file

Library:

• Fixed issue #1 about getData()
• Upgraded dependencies
• Added error checking to getData
• Made GoogleAuthClient private

Example:

• Added GET data button

• Fixed erranous getFileID function

• Changed all positional optional arguments to named optional arguments

• Added the ability to specify parents to files in createFile()

• Removed author label in pubspec.yaml
• Made the README.md a lot better
• Renamed the docs folder to doc

API:

• Added API documentation to complement dartdocs
• Drive helper now interactively signs in if the user is signed out
• Added sign out and disconnect methods to the API
• Renamed exportFileData to exportFile

Example app:

• Added sign out and disconnect functionality to the app in the account page
• Added flutter phoenix to restart the app after sign out or disconnect

• Updated pubspec.yaml
• Added example application called example
• Updated the way the mime types are accessed
• Changed createFile function to include preliminary data
• Added export mime type option to appendFile
• Added command to open file from fileID
• Added getData to get data as plain text

• Initial commit