Split source into multiple files

SIGUSR1 now causes reload of blacklist
sigstoped now resumes all processes it stoped upon reciving SIGINT or SIGTERM
sigstoped avoids stopping processes that have no top level window left TODO: is this enough?

process.h

@@ -0,0 +1,15 @@
+#pragma once
+#include <string>
+#include <sys/types.h>
+
+class Process
+{
+public:
+    pid_t pid = -1;
+    std::string name;
+    
+    bool operator==(const Process& in);
+    bool operator!=(const Process& in);
+    Process(){}
+    Process(pid_t pidIn);
+};