Add AbstractTextDumper to implement stream holding and indendation

src/ObjWriting/Dumping/SndCurve/SndCurveDumper.cpp

@@ -9,7 +9,7 @@ SndCurveDumper::SndCurveDumper(std::ostream& stream)
 }
 
 SndCurveDumper::SndCurveDumper(std::ostream& stream, const size_t precision)
-    : m_stream(stream),
+    : AbstractTextDumper(stream),
       m_precision(precision),
       m_current_knot(0u),
       m_total_knots(0u)

src/ObjWriting/Dumping/SndCurve/SndCurveDumper.h

@@ -1,11 +1,13 @@
 #pragma once
+
 #include <ostream>
 
-class SndCurveDumper
+#include "Dumping/AbstractTextDumper.h"
+
+class SndCurveDumper : AbstractTextDumper
 {
     static constexpr auto DEFAULT_PRECISION = 4;
 
-    std::ostream& m_stream;
     size_t m_precision;
     size_t m_current_knot;
     size_t m_total_knots;