replace all instances of wxString with std::string in all cases not

directly involved in either the GUI or other wxWidget classes like wxFile

Utilities/StrFmt.cpp

@@ -0,0 +1,63 @@
+#include "stdafx.h"
+#include "StrFmt.h"
+
+//wrapper to deal with advance sprintf formating options with automatic length finding
+//can't take strings by reference because of "va_start", so overload it with char *
+std::string fmt::FormatV(const char *fmt, va_list args)
+{
+	int length = 256;
+	std::string str;
+
+	for (;;)
+	{
+		std::vector<char> buffptr(length);
+		size_t printlen = vsnprintf(buffptr.data(), length, fmt, args);
+		if (printlen >= 0 && printlen < length)
+		{
+			str = std::string(buffptr.data(), printlen);
+			break;
+		}
+		length *= 2;
+	}
+	return str;
+}
+
+std::string fmt::FormatV(std::string fmt, va_list args)
+{
+	std::string str = FormatV(fmt.c_str(), args);
+	return str;
+}
+
+//convert a wxString to a std::string encoded in utf8
+//CAUTION, only use this to interface with wxWidgets classes
+std::string fmt::ToUTF8(const wxString& right)
+{
+	auto ret = std::string(((const char *) right.utf8_str()));
+	return ret;
+}
+
+//convert a std::string encoded in utf8 to a wxString
+//CAUTION, only use this to interface with wxWidgets classes
+wxString fmt::FromUTF8(const std::string& right)
+{
+	auto ret = wxString::FromUTF8(right.c_str());
+	return ret;
+}
+
+//TODO: remove this after every snippet that uses it is gone
+//WARNING: not fully compatible with CmpNoCase from wxString
+int fmt::CmpNoCase(const std::string& a, const std::string& b)
+{
+	if (a.length() != b.length())
+	{
+		return -1;
+	}
+	else
+	{
+		return std::equal(a.begin(),
+			a.end(),
+			b.begin(),
+			[](const char& a, const char& b){return tolower(a) == tolower(b); })
+			? 0 : -1;
+	}
+}