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/logid.h

@@ -5,7 +5,7 @@
 
 namespace logid
 {
-    void reload();
+    // void reload();
 
     extern bool kill_logid;
     extern std::mutex finder_reloading;