Maelstrom CD-Key Tester 4.3.3

• Fixed an error while testing with products in certain cases (invalid filetime)
• Instead of wiping the key files when Maelstrom loads the keys, they will
  instead be wiped before Maelstrom writes back the unused keys before closing
  which prevents an issue where Maelstrom encounters a runtime error, closes
  and then the CD-Key folder is completely empty
• If an invalid MPQ filename is encountered while testing keys for a certain
  product, testing will stop
• Updated the readme