Feature : --key-file option for CLI (#816)

* removing readFromLine

* Removing gui-prompt

* execute uses an arg list.

* Testing with key-file

* Fixing the -a option in EntropyMeter.

src/keys/CompositeKey.cpp

@@ -80,29 +80,6 @@ CompositeKey& CompositeKey::operator=(const CompositeKey& key)
     return *this;
 }
 
-/*
- * Read a key from a line of input.
- * If the line references a valid file
- * path, the key is loaded from file.
- */
-CompositeKey CompositeKey::readFromLine(QString line)
-{
-
-  CompositeKey key;
-  if (QFile::exists(line)) {
-      FileKey fileKey;
-      fileKey.load(line);
-      key.addKey(fileKey);
-  }
-  else {
-      PasswordKey password;
-      password.setPassword(line);
-      key.addKey(password);
-  }
-  return key;
-
-}
-
 QByteArray CompositeKey::rawKey() const
 {
     CryptoHash cryptoHash(CryptoHash::Sha256);