2.1.1: a bunch of fixes

- Enabled delay-agnostic AEC on Windows & Linux, it seems to make a difference after all (telegramdesktop/tdesktop#4881)
- Fixed PulseAudio crashes, at least I hope so (closes #42)
- Fixed parsing of floating-point server config values in some locales in Linux

VoIPServerConfig.cpp

@@ -7,6 +7,8 @@
 #include "VoIPServerConfig.h"
 #include <stdlib.h>
 #include "logging.h"
+#include <sstream>
+#include <locale>
 
 using namespace tgvoip;
 
@@ -40,12 +42,12 @@ double ServerConfig::GetDouble(std::string name, double fallback){
 	MutexGuard sync(mutex);
 	if(ContainsKey(name)){
 		std::string val=config[name];
-		char* end;
-		const char* start=val.c_str();
-		double d=strtod(start, &end);
-		if(end!=start){
-			return d;
-		}
+		std::istringstream stm(val);
+		double rval=fallback;
+		stm.imbue(std::locale("C"));
+		stm >> rval;
+		if(!stm.fail())
+			return rval;
 	}
 	return fallback;
 }