fix build with mingw not supporting std::to_char with floats

damc_common/Osc/OscNode.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <functional>
+#include <stdint.h>
 #include <string>
 #include <type_traits>
 #include <variant>

damc_gui/OscWidgetMapper.cpp

@@ -2,6 +2,7 @@
 #include "QtUtils.h"  // IWYU pragma: keep: needed for qOverload on older Qt versions (< 5.7)
 #include <charconv>
 #include <spdlog/spdlog.h>
+#include <sstream>
 #include <stdexcept>
 #include <type_traits>
 
@@ -155,14 +156,10 @@ template<class T, class UnderlyingType> std::string OscWidgetMapper<T, Underlyin
 	} else if constexpr(std::is_same_v<UnderlyingType, bool>) {
 		return value ? "true" : "false";
 	} else {
-		std::string result;
-		result.resize(128);
-		auto [ptr, ec] = std::to_chars(result.data(), result.data() + result.size(), this->value);
-		if(ec != std::errc{}) {
-			throw std::runtime_error(fmt::format("failed to convert value {} to string", value));
-		}
-		result.resize(ptr - result.data());
-		return result;
+		std::ostringstream oss;
+		oss.imbue(std::locale::classic());
+		oss << this->value;
+		return oss.str();
 	}
 }