[Infra] The Big VPR Pragma Commit

VPR is moving to a style that uses "#pragma once" instead of header
gaurds. These are less error prone and may be slightly more performant.

Converted all of the header gaurds in VPR into pragma once's.

Also moved all pragma onces to the top of all header files to maintain a
consistent style. It is a good idea to have them as the very first line
in all header files.

While going through all header files, cleaned up any extra header
includes which were including things they did not need.

Author: AlexandreSinger

vpr/src/analytical_place/analytical_placement_flow.h

@@ -1,12 +1,11 @@
+#pragma once
 /**
  * @file
  * @author  Alex Singer
  * @date    September 2024
  * @brief   Methods for running the Analytical Placement flow.
  */
 
-#pragma once
-
 // Forward declarations
 struct t_vpr_setup;
 

vpr/src/analytical_place/analytical_solver.h

@@ -1,3 +1,4 @@
+#pragma once
 /**
  * @file
  * @author  Alex Singer and Robert Luo
@@ -6,8 +7,6 @@
  *          to define the functionality of all solvers used in the AP flow.
  */
 
-#pragma once
-
 #include <memory>
 #include "ap_flow_enums.h"
 #include "ap_netlist.h"