cli: Move most classes to shared lib for reuse

shared/nothingprocessor.h

@@ -0,0 +1,19 @@
+#ifndef NOTHINGPROCESSOR_H
+#define NOTHINGPROCESSOR_H
+#include <QVector>
+#include "processor.h"
+#include "pagedata.h"
+
+class NothingProcessor : public Processor
+{
+  public:
+	NothingProcessor();
+
+  public:
+	QVector<PageData> process(const QByteArray &data) const override
+	{
+		return {};
+	}
+};
+
+#endif // NOTHINGPROCESSOR_H