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.

tests/TestKeys.h

@@ -28,7 +28,6 @@ class TestKeys : public QObject
 private slots:
     void initTestCase();
     void testComposite();
-    void testCompositeKeyReadFromLine();
     void testFileKey();
     void testFileKey_data();
     void testCreateFileKey();