cli: Move most classes to shared lib for reuse

shared/pagedata.cpp

@@ -0,0 +1,13 @@
+#include "pagedata.h"
+
+QDataStream &operator<<(QDataStream &out, const PageData &pd)
+{
+	out << pd.pagenumber << pd.content;
+	return out;
+}
+
+QDataStream &operator>>(QDataStream &in, PageData &pd)
+{
+	in >> pd.pagenumber >> pd.content;
+	return in;
+}