ENH: force to use . as decimal point

"std::cout << float number" is unsafe which
may use , as decimal point when switch language.

Signed-off-by: salt.wei <salt.wei@bambulab.com>
Change-Id: I8a379117168eab0111dc93987b1d6130a741ade6

Author: SaltWei

src/libslic3r/GCode/WipeTower.cpp

@@ -49,7 +49,7 @@ class WipeTowerWriter
         {
             // adds tag for analyzer:
             std::ostringstream str;
-            str << ";" << GCodeProcessor::reserved_tag(GCodeProcessor::ETags::Height) << m_layer_height << "\n"; // don't rely on GCodeAnalyzer knowing the layer height - it knows nothing at priming
+            str << ";" << GCodeProcessor::reserved_tag(GCodeProcessor::ETags::Height) << std::to_string(m_layer_height) << "\n"; // don't rely on GCodeAnalyzer knowing the layer height - it knows nothing at priming
             str << ";" << GCodeProcessor::reserved_tag(GCodeProcessor::ETags::Role) << ExtrusionEntity::role_to_string(erWipeTower) << "\n";
             m_gcode += str.str();
             change_analyzer_line_width(line_width);
@@ -58,7 +58,7 @@ class WipeTowerWriter
     WipeTowerWriter& change_analyzer_line_width(float line_width) {
         // adds tag for analyzer:
         std::stringstream str;
-        str << ";" << GCodeProcessor::reserved_tag(GCodeProcessor::ETags::Width) << line_width << "\n";
+        str << ";" << GCodeProcessor::reserved_tag(GCodeProcessor::ETags::Width) << std::to_string(line_width) << "\n";
         m_gcode += str.str();
         return *this;
     }