Addressed issues found by Google code lint.

Fixed:
 - Removed trailing whitespace.
 - Removed out of date TODO's.
 - Added #include<algorithm> to DataManager.cpp
 - Reordered includes to include C system headers before C++ system headers.
 - Added username to TODO's
 - Renamed include guards to use full project name as prefix.
 - Made methods and parameters const where possible.
 - Made UDPSocket constructor explicit.

Won't Fix:
 - snprintf is introduced in C++11.
 - Trailing comments at the end of namespace & header guards
 - Did not re-inlude headers already included by the matching XPC header.
 - localtime is fine since X-Plane is not multithreaded at all on the plugin side.
 - Linter confuses #elif with parens as a function call.
 - namespace indentation

xpcPlugin/Log.cpp

@@ -4,10 +4,11 @@
 
 #include "XPLMUtilities.h"
 
-#include <chrono>
 #include <cstdarg>
 #include <cstdio>
 #include <ctime>
+
+#include <chrono>
 #include <iomanip>
 #include <sstream>
 
@@ -33,7 +34,7 @@ namespace XPC
 			<< std::setw(2) << tm->tm_min << ":"
 			<< std::setw(2) << tm->tm_sec << "."
 			<< std::setw(3) << ms.count() << "]";
-		
+
 		std::fprintf(fd, ss.str().c_str());
 	}