Clean up includes in cpp files

RecastDemo/Source/Sample_SoloMesh.cpp

@@ -19,14 +19,10 @@
 #include "Sample_SoloMesh.h"
 
 #include "DetourDebugDraw.h"
-#include "DetourNavMesh.h"
 #include "DetourNavMeshBuilder.h"
 #include "InputGeom.h"
-#include "Recast.h"
 #include "RecastDebugDraw.h"
-#include "RecastDump.h"
 #include "SDL_opengl.h"
-#include "Sample.h"
 #include "Tool_ConvexVolume.h"
 #include "Tool_Crowd.h"
 #include "Tool_NavMeshPrune.h"
@@ -35,9 +31,6 @@
 
 #include <imgui.h>
 
-#include <cmath>
-#include <cstring>
-
 const char* Sample_SoloMesh::drawModeNames[]{
 	"Input Mesh",
 	"Navmesh",