Implement raw DeviceMonitor

Multiple things have been done in this commit; the base of the new
backend has effectively been created. This branch currently has many
vital parts commented out. Therefore, this branch is currently only
intended for debugging.

src/logid/util.cpp

@@ -4,6 +4,7 @@
 #include <cstdarg>
 #include <cmath>
 #include <algorithm>
+#include <stdexcept>
 
 #include "util.h"
 
@@ -34,6 +35,7 @@ const char* logid::level_prefix(LogLevel level)
     return "DEBUG";
 }
 
+/*
 Direction logid::getDirection(int x, int y)
 {
     if(x == 0 && y == 0) return Direction::None;
@@ -111,6 +113,8 @@ Action logid::stringToAction(std::string s)
     throw std::invalid_argument(original_str + " is an invalid action.");
 }
 
+ */
+
 LogLevel logid::stringToLogLevel(std::string s)
 {
     std::string original_str = s;