Add version system

WatchfulEye/src/main.cpp

@@ -1,8 +1,10 @@
 // Watchful Eye main file
 #include <iostream>
 
+#include "version.h"
+
 int main(int argc, char* argv[]) {
-    std::cout << "Watchful Eye\n";
+    std::cout << "Watchful Eye " APPVERSION "\n";
 
     std::cin.get();
     return EXIT_SUCCESS;

WatchfulEye/src/version.h.in

@@ -0,0 +1,2 @@
+// Version configured header file
+#define APPVERSION "@APPVERSION@"