Add OTP login feature and fix webdriver bugs

[ferpasri]

1. Add an OTP feature in TESTAR to enable reading 6-digit codes for two-factor authentication

• ImapGmailReader reads inbox emails to extract the OTP code

• TOTPGenerator uses the two-factor authentication code to generate an OTP code every 30 seconds

• TOTPGenerator validated with a company

• Discuss how to document this OTP feature or prepare a protocol with an example (add to wiki temporally)

2. Fix Webdriver module hangs when starting a new sequence #412 by removing the synchronized updateHandlesList implementation with a multi-thread safe CopyOnWriteArrayList solution

• Tested by OU student during experimentation
• Discuss how to test these thread-safe implementations

3. Fix a NumberFormatException with invalid maxLength web properties

[ramondevries]

After revieweing during meeting it is ok, we will validate thread-safe later.