Adds FileTransferManager class

[nitin710]

Description

• Adds implementation for FTP server
  • Adds FileTransferManager class

Requirements

• New library: https://github.com/EmotiBit/EmotiBit_SimpleFTPServer
• https://github.com/EmotiBit/EmotiBit_SimpleFTPServer/pull/3

Issues Referenced

• None

Documentation update

• ToDo: Update documentation.
  • Adding new dependency in the library list
  • How to enter FTP mode

Notes for Reviewer

• It is important to setup FTP client on the computer as shown here: https://mischianti.org/simple-ftp-server-library-now-with-support-for-wio-terminal-and-sd/#Configure_client

Testing

Results

• Synopsis of results, details if required.

Feature Tests

• FTP server functionality on Feather M0 (verify serial out saying "not currently supported")
• FTP server functionality on ESP32
• FTP server does not start when recording
• FTP server example: EmotiBit-FileTransferManager

Shared files

• Firmware binary:
  • 1.9.0.feat-FtpServer.1.zip

Checklist to allow merge

• [ ] All dependent repositories used were on branch master
• Firmware
  • [x] Set testingMode to TestingMode::NONE
  • [x] Set const bool DIGITAL_WRITE_DEBUG = false (if set true while testing)
  • [x] Update version in EmotiBit.h
  • [ ] Update library.properties to the correct version (should match EmotiBit.h)
• [ ] doxygen style comments included for new code snippets
• [ ] Required documentation updated

Screenshots: